View source for How-To: Creating a Maintain Table screen

=Overview=

'''A Maintain Table screen allows CRUD (Create, Read, Update, Delete [http://en.wikipedia.org/wiki/Create,_read,_update_and_delete]) operations for a specific system table/lookup table of openPETRA.'''

This tutorial outlines the basic steps that are involved in creating a Maintain Table screen, starting off with an existing Maintain Table screen which is then copied and modified.

''Don't get intimidated by fact that are quite a few steps involved - once you have done them several times, you will remember them pretty quickly.''
(A developer who has already done a few Maintain Table Screens will be able to do a new, simple Maintain Table Screen that is based on an existing Maintain Table Screen in about an hour or less.)


==Types of Maintain Table Screens==
There are three types of Maintain Table screens:
* '''Maintain Table screens which are used for editing the values of a 'Cacheable DataTable'.'''
** A 'Cacheable DataTable' usually contains the data of a ''single database table'' which is transferred to the Client once and is saved to a local  file which resides at the client computer's harddisk at the first client request of the Cacheable DataTable. These datatables are also ''held in memory (RAM) for quick access''. The Cacheable DataTables are managed by a Cache Manager Class on both the client and server side, which make sure that all Cacheable DataTables of all clients are kept up-to-date and in sync, among other things. 
*** 'Candiates' for Cacheable DataTables, and therefore for Maintain Table screens which are editing the values of Cacheable DataTables, are database tables that are ''frequently accessed'' either by the server or the client or whose contents are ''frequently displayed'', e.g. values of frequently displayed ComboBoxes or Lists.
** This type of Maintain Table screen is the '''easiest''' to do and '''needs the least programming''' because the Cache Manager Classes encapsulate most of the functionality that is needed. ''The person who creates such screens does not need know about the client-server architecture of openPETRA, and needs little programming know-how'' - therefore such Maintain Table screens are ideally suited for people who join the development of openPETRA.
* '''Maintain Table screens which are used for editing the values of a single database table that ''is not'' a 'Cacheable DataTable'.'''
** This type of Maintain Table screen is somewhat more involved than the Maintain Table screens which are editing the values of Cacheable DataTables. 
** '''More programming is needed''', since such a screen uses a WebConnector Class for reading and writing of data from/to the database. One WebConnector Class needs to be created for every screen. These Classes aren't hard to do and follow a standard pattern, but in order for creating those Clases, the '''programmer needs''' to know more about the client-server architecture of openPETRA and needs '''to be a more experienced openPETRA programmer'''.
* '''''Special'' Maintain Table screens''' 
** which 
*** edit values of several database tables at once, ''or'' 
*** need to read in the values of several database tables in order to edit one database table, ''and/or''
*** don't follow the standard 'list/detail' format of the typical Maintain Table screens, ''and'' 
*** have custom loading/saving routines to update the database.
*** are unique within openPETRA and don't resemble each other, so a custom GUI needs to be developed for each screen.
** Those screens' design and logic is usually similar to many Edit screens and therefore no general principle can be given how they are done. (Most likely a more involved WebConnector Class will be needed for such screens; some screens might even be better done with a UIConnector Class.)
** For those reasons, '''an experienced openPETRA developer needs to do those kind of screens'''.
** There are not that many Maintain Table screens which fall into this category.

=Creating a new Maintain Table screen=
The following ''general'' instructions can help in ''creating a simple'' new Maintain Tables screen ''based on a similar, existing Maintain Tables screen''. (Many Maintain Tables screens are rather simple and similar to existing ones. To start off with a completely new Maintain Tables screen that isn't based on an existing one is obviously more complicated. However, from Step 4 onwards, the same procedures would apply to such new screens as well.)

==Step 1: Choosing a similar, existing Maintain Tables screen==
* Start openPETRA.
* Using the Navigation Panel, go to the Module (and perhaps Sub-Module) that contains the Area 'Setup' where a Task for a similar screen exists (in the Task List on the right hand side).
** It is advisable to look for a similar screen in the Module where your new screen should end up as well - this makes it easier to copy the screen.
* Open the screen that you think is similar and check that it indeed is similar to the screen that you are about to do.
** Check for 
*** the overall appearance of the screen, 
*** that there is a similar number of data fields in the columns of the grid and 
*** that there is a similar number of data fields in the details section below the grid.
** Should one or two columns in the grid or one or two data fields in the details section be different, this screen is still suitable for a 'similar screen' that we can start off with.

==Step 2: Copying existing screen definition file to new screen==
===Overview===
All Maintain Table screens are based on a 'screen definition file', which is passed to a Generator. The Generator generates the C# source code and the Resource File (contains e.g. Icons) which form the actual screen in openPETRA.

openPETRA's Screen Definition Files are plain text files which are structured in the [[https://sourceforge.net/apps/mediawiki/openpetraorg/index.php?title=Development_with_Code_Generation#YAML YAML]] syntax.

By copying the screen definition file of the existing screen, we will get an exact copy of the layout and data of the existing screen - in a new file. This will be our starting point for the changes we need to make to change the data and layout into 'our' new Maintain Table screen.

===Locating existing screen's screen definition file===
* Recall what Module, Sub-Module and Area you chose, and which Task you chose from the Task List to bring up the existing, similar Maintain Table screen.
* Open the following file in a text editor (e.g. Notepad, Notepad++)
 U:\openpetraorg\csharp\ICT\Petra\Definitions\UINavigation.yml
* This file contains a structure that is used for builing the Navigation structure which you see in the Main Menu's Navigation Panel of openPETRA.
* Scroll through the file until you find the Module, Sub-Module, Area and Task that describes the Task that you clicked to bring up the existing, similar Maintain Table screen (the hierarchy is created by indentation!).
** The line that describes the exact Task contains the text 'ActionOpenScreen=', followed by text. That text, usually starting with 'TFrm...', is the ''Class Name'' of the existing, similar Form.
** To find out the ''File Name'' of its 'screen definition file', leave out the 'TFrm' and take only the remainder of the text. Example: if the text is 'ActionOpenScreen=TFrmPartnerTypeSetup', the Class Name is 'TFrmPartnerTypeSetup' and the File Name is 'PartnerTypeSetup'.
** append ".yaml" to get the full File Name including File Extension. Example: 'PartnerTypeSetup' becomes 'PartnerTypeSetup.yaml'.

====Determining full file path of the existing screen's screen definitions file====
* The line that describes the exact Task, or more likely the Elements who are one or two steps higher in the hierarchy (=one or two steps less indented), will contain the text 'Namespace='. It is followed by a text that ends in '.Setup', e.g. 'Ict.Petra.Client.MPartner.Gui.Setup'.
* This tells you the last part of the folder where the screen definition file can be found: replace the dots ('.') with backslashes ('\'), put the word '\lib\' inbetween 'Client' and 'MPartner' and precede this with 'U:\openpetraorg\csharp\', and add the File Name to get the full file path: '<code>U:\openpetraorg\csharp\ICT\Petra\Client\lib\MPartner\gui\setup\PartnerTypeSetup.yaml</code>'.

===Copying the screen definitions file===
* Make a copy of the screen definitions file (whose full file name you just determined) in the same directory.
** Should your new Maintain Table screen need to go into a different namespace, choose the appropriate directory (ending in 'gui\setup') and place the copied file there! 
*** Example: If your Maintain Table screen should go into the Ict.Petra.Client.MFinance.Gui.Setup namespace, the appropriate directory would be 'Ict\Petra\Client\lib\''MFinance\gui\setup''.)
* Name the file according to ''what'' the screen will maintain
** Example: if the screen will maintain Partner Types, name the file 'PartnerTypeSetup.yaml' (please use the singular, not the plural form).
** The name of the file should end with 'Setup.yaml'.

==Step 3: Modifying screen definition file to suit the new screen's data and layout==
Each YAML file has two distinct sections: 'Header information' and 'Data Fields and Layout'.

===Header Information===
The Header Information contains a few Elements. The ones that are particularly important for Maintain Table screens are explained in the following sections. A general overview of all the Elements can be found on page [[Documentation_YAML_for_OpenPetra_Forms]], in the 'Attributes of the root node' section.

====FormTitle Element====
The value of the 'FormTitle' Element is constructed as follows: take the file name of the YAML file, leave out the 'Setup' string and the '.yaml' extension, change it to plural form, put space characters between the words and prepend the string with 'Maintain '.

Example:
If the screen's YAML file is named 'MaritalStatusSetup.yaml', the 'FormTitle' will be 'Maintain Marital Statuses'.

====DetailTable Element====
The value of the 'DetailTable Element' is the 'Class Name' of the openPETRA Database Table whose records your Maintain Table screen maintains. It can be constructed from the name of the openPETRA Database Table as follows: capitalise the first character, capitalise the first character after all underscore characters ('_'), and then remove all underscore characters.

Examples: 
p_partner becomes <code>PPartner</code>, pt_marital_status becomes <code>PtMaritalStatus</code>.

Technical detail: the Class that you specify with the 'Class Name' represents a 'Typed DataTable', which is a C# object representation of the openPETRA Database Table.

====CacheableTable Element====
The 'CacheableTable' Element must be present for Maintain Table screens which are based on 'Cacheable DataTables'. For all other Maintain Table screens, the Element must be omitted.

The value of the 'CacheableTable' Element must be set to the name of the Cacheable DataTable whose records the screen will maintain. You will either been given the correct name, or you should know it because you are a more advanced openPETRA developer.

====Namespace and UsingNamespace Elements====
The values of the 'Namespace' and 'UsingNamespace' Elements will likely ''not need to be changed'' if the YAML file which was used as a template for the new YAML file was copied within the same directory. 

=====Namespace Element=====
The value of the 'Namespace' Element can be constructed by replacing 'xxx' with the name of the openPETRA Module in which the Maintain Table screen needs to go in the following string: 'Ict.Petra.Client.Mxxx.Gui.Setup'. 
Example: for the Partner Module, the 'Namespace' Element would be 'Ict.Petra.Client.MPartner.Gui.Setup'.

Technical detail: The 'Namespace' Element specifies the C# Namespace that the generated Maintain Table screen will be placed into. The Generator uses it to put the screen's Class into the C# Namespace in the generated *.cs and *.Designer.cs files.

=====UsingNamespace Element=====
To get the value of the 'UsingNamespace' Element, check the values of 'UsingNamespace' Elements of other YAML files that are found in the directory where your YAML file is placed. 
* Find an existing YAML file that references an openPETRA Database Table that is in the same 'area' in the openPETRA DB documentation (the 'area' is denoted by the top-left selection box in the openPETRA DB documentation) than the openPETRA DataBase Table which you specified in the 'DetailTable Element'.
* Copy the value of 'UsingNamespace' over into your YAML file.
* If you can't find an appropriate existing YAML file, or if you are not sure what to put into the 'UsingNamespace' Element, seek help from other openPETRA developers in the [http://apps.sourceforge.net/phpbb/openpetraorg/viewforum.php?f=3 openPETRA Developer Forum].

Technical detail: The 'UsingNamespace' Element specifies a C# Namespace that needs to be referenced in order to get the definition of the Class that is specified in the 'DetailTable' Element (the Class represents a 'Typed DataTable'). The Generator uses the 'UsingNamespace' Element to put a 'using' clause in the generated *.cs and *.Designer.cs files.

Troubleshooting: Should you later run into compilation errors that mention that a Class that is named like the 'DetailTable' cannot be found, then the 'UsingNamespace' Element is not correct.

===Data Fields and Layout===
This section of the YAML file is introduced by the Element 'Actions' or 'Controls'. From here onwards, the YAML file specifies the layout, the Controls on the screen and the data that they are bound to.

====Layout====
Most 'Maintain Table' screens follow a ''standardised layout pattern''. Only more complicated Maintain Table screens (who have many or unusual controls or a different user interface concept altogether) should deviate from that layout. The purpose of the standardised layout is to create an easily understood and recognised layout pattern across the application. (A positive side effect is that it also simplifies and speeds up the creation of these screens, as you will see.)

The standardised layout pattern describes the following:
* Main Menu (File, Edit, Help)
* ToolBar (Save and New ToolBarButtons)
* Grid (List) Part
* Details (Bottom) Part

The following sections describe these parts of the user interface.

=====Main Menu=====
The usual MenuItems of Edit Screens (File, Edit and Help along with their sub-MenuItems) are automatically generated, and those are sufficient. ''You don't need to do anything in your YAML file for the Main Menus'' (unless you have a more complicated Maintain Table screens [who have many or unusual controls or a different user interface concept altogether] which may require additional MenuItems).

=====ToolBar=====
The ToolBar contains two ToolBarButtons - 'Save' and 'New xxx'. 
* The 'Save' Button lets the user save any changes to the database and is automatically generated, as this an Edit Screen. 
* The 'New xxx' Button lets the user create a new data row. This Button needs to be done by you, but there will be already a definition for it in the YAML file since you copied it from another Maintain Table screen, which will have the same Button.

The definition for the ToolBar and the ToolBarButton looks like this:
 Toolbar:
     tbbNew:
         Label: New ''xxx''

Change the 'xxx' in the text 'New xxx' to reflect ''what'' will be created new - this is the singular form of the FormTitle without the word 'Maintain'. The singular form is used since the user is creating ''one'' new data row, and the FormTitle will be plural because it lets the user see and edit ''many'' data rows.

Example: If the 'FormTitle' is 'Maintain Business Codes', the Label of the tbbNew button should be '<code>Label: New Business Code</code>'.

Technical detail: Since the ToolBarButton is called tbb''New'', the Generator automatically 'wires' it up with the Action act''New''. The result is that if the user presses this ToolBarButton, the Action 'actNew' is executed (which creates a new data row that can be edited in the Details Part).

=====Grid (List) Part=====
The Grid part contains a list of data rows. These are the rows of data that come out of the database table which your particular screen is maintaining. The Grid has several Columns, which display data fields from the database table. 

As the database tables have different data fields, the Columns will be different on each Maintain Table screen. You need to specify the data fields that make up the Columns of the Grid of your screen.

Note: next to the Grid part is a Panel with an 'Add' Button. ''You don't need to do anything in your YAML file for this Panel, as it is standardised. The 'Add' Button is automatically 'wired' up by the Generator.''

Here is an example that shows how the Grid is defined in the YAML file:
 grdDetails:
     Dock: Fill
     Columns: [DetailCode, DetailDescription, DetailDeletableFlag]
     ActionFocusRow: FocusedRowChanged

The only thing that you need to change is the line that starts with '<code>Columns:</code>'.

======Specifying the Columns of the Grid======
The line in the YAML file that that starts with '<code>Columns:</code>' defines 
* which data fields from the database table that your screen is maintaining are displayed in the Grid;
* in which order the data fields are displayed.

In order to identify the names of the data fields from the database table that your screen is maintaining, you need to look at the definition of the database table. 

You will find the database table definition in the [[http://openpetraorg.sourceforge.net/dbdoc/ Database Design of OpenPetra.org]]. 
* Locate the database table in the list on the left hand side and click on it to show its definition on the right hand side. 
** In case you can't see the database table that your screen is maintaining, you will need to change the 'area' of the database that is displayed in the list on the right. Click on one of the 'areas' that is listed in the box on the top left of the page, above the list of database tables, to show a different list of database tables.
* Maintain Table screens usually display all fields of the underlying database table, except the following fields (which are system fields that track which user changed what record, and when): <code> s_date_created_d, s_created_by_c, s_date_modified_d, s_modified_by_c, s_modification_id_c</code>.
* Note down the names of the individual data fields which will be displayed in the Columns of the Grid.
* Change the name of each data field as follows: 
** remove the 'prefix', which is the first letter (or first two letters) followed by an underscore character ('_');
** remove the 'suffix', which is the last underscore character in the name followed by a letter;
** capitalise the first character, capitalise the first character after all underscore characters ('_'), and then remove all underscore characters. 
*** Examples: '<code>p_description_c</code>' becomes 'Description', '<code>p_deletable_l</code>' becomes 'Deletable', '<code>p_method_of_contact_code_c</code>' becomes 'MethodOfContactCode'.
* Prefix the name of the data field with the word 'Detail'.
** Example: 'DetailMethodOfContactCode'

Once you have got the names of the individual data fields which will be displayed in the Columns of the Grid, you can build the 'Columns:' Element as follows:
* within the opening and closing brackets '[' and ']'
** place the names of the data fields
** in the order that they should appear in the Grid
** and separate the names with ', '.

Example: 
 Columns: [DetailBusinessCode, DetailBusinessDescription, DetailDeletable]

relates to the data columns <code>p_business_code_c</code>, <code>p_business_description_c</code> and <code>p_deletable_l</code> of the <code>p_business</code> database table.

As for the order of the Columns, usually the data fields should be displayed in the order they appear in the database table. An exception to that is the 'deletable' data column, which should always go at the right hand of all the other columns, even if it is in the middle of other columns in the database table definition.

TODO: Custom Headings and Custom Formatting of Data Column

=====Details (Bottom) Part=====
The Details part consists of a Panel, 'pnlDetails', on which several Controls are placed. Each of these Controls represents a data field of the database table which your particular screen is maintaining. 

As the database tables have different data fields, the Controls and the type of Controls (e.g. TextBoxes, CheckBoxes, ...) will be different on each Maintain Table screen. You need to specify the data fields that make up the Controls. These will be at least the data fields that are used for the Columns of the Grid of your screen, but possibly more, if you chose to leave out some Columns in the Grid for the data fields of the database table which your particular screen is maintaining.

The next section describes the process of placing the controls in the Panel and how to influence the arrangement of the Controls on the Panel.

====Data Fields====
TODO

==Step 4: Generating the screen's source code with the WinForms Generator==
* Open a Command Prompt (a.k.a. 'DOS Window').
* enter the following commands:
 U:  <ENTER>
 cd \openpetraorg  <ENTER>
* after that, verify that the 'nant' build system is working by entering
 nant help  <ENTER>
* you should see a list of possible commands and their explanations on the screen
** if you get an error message, then the setup of the development environment is not fully completed, or at least not working, on your computer. Refer to [[Setup_of_Development_Environment_for_Windows#NAnt]] for instructions to set nant up correctly.
* enter the following command
 nant generateWinform -D:file=MPartner/gui/setup/YourYamlFileSetup.yaml
- potentially replacing 'MPartner' with the name of another openPETRA Module, and replacing 'YourYamlFileSetup.yaml' with the actual name of your new yaml file.
* the WinForms Generator will launch and process your new yaml file.
** if the Generator continues to build a C# project and then launches the openPETRA Client, your yaml file doesn't contain any 'bad' errors.
** if the Generator stops and issues an error message: try to find out and fix what is wrong, according to the text of the error message.
** in case the Generator stops with an Exception, check the overall structure of your yaml file for any potential errors, such as: missing or misplaced brackets ('[' and ']') or curly braces ('{' or '}'), wrong indentation, missing colons (':') or missing or superfluous commas (',') or space characters (' ').
** fix what you think is wrong and run the Generator again, until the Generator continues to build a C# project.
** if you are 'stuck', seek help from other developers in the [http://apps.sourceforge.net/phpbb/openpetraorg/viewforum.php?f=3 Developer area in the openPETRA Forums].

==Step 5: Adding new source code files to corresponding C# Project==
===Step 5a: Adding the generated files===
The generated files now need to be added to the C# Project in which they belong so they can get compiled.

* Start the SharpDevelop IDE
* Run the Menu Command 'File' -> 'Open' -> 'Project/Solution...'
* Select the file
 U:\openpetraorg\csharp\ICT\Client.sln
and choose 'Open'.
* SharpDevelop will open a group of C# Projects that contain all the client-side program code of openPETRA. (Such a group of Projects is called a 'Solution', hence the '.sln' file extension.)
* In the 'Projects' list, locate the C# Project that should contain the new Maintain Table screen. 
** The C# Project you need to choose will depend on where your new yaml file is in the folder structure of openPETRA.
*** Example: if your new yaml file is located in U:\openpetraorg\csharp\ICT\Petra\Client\lib\MPartner\gui\setup, then the corresponding C# Project file is called Ict.Petra.Client.MPartner.Gui.Setup
* Right-click on the correct C# Project in SharpDevelop and choose 'Add' -> 'Existing Item...'
* Locate the C# file that the Generator created and choose 'Open'. 
** The C# file is in the same folder as your new yaml file and is called the same, except that it's file extension is .cs, and not .yaml. 
*** Example: if the yaml file of the new screen is called 'LocationTypeSetup.yaml', the file that you should choose will be called 'LocationTypeSetup.cs'. (Be sure ''not'' to select the file that ends in '.Designer.cs'!) 
* Expand the C# Project by clicking on the '+' symbol in front of it.
** You should now see a few nodes. One of that node is called like the C# file, with a '+' symbol in front of it.
* Expand that node by clicking on the '+' symbol.
** You will see that additional files got added automatically - one that is called like your C# file, but with the file extension '.Designer.cs', and a file that is called like your C# file, but with the file extension '.resx'. Those file were created by the WinForms Generator and are necessary for the form (but you will never need to touch them!). 

===Step 5b: Creation and adding of the *.ManualCode.cs file ===
* Right-click on the node that represents your Maintain Table's C# file (this is the one you just expanded) and choose 'Add' -> 'Existing Item as Dependent Item...'.
* In the 'Add existing files' dialog you will make a copy of an existing file before adding it:
** Locate a file that is called like the yaml file of the existing, similar screen that you started off with, except that its file extension is '.ManualCode.cs' instead of '.yaml'. 
*** Example: if the yaml file of the existing, similar screen is called 'PartnerTypeSetup.yaml', the file that you should copy will be called 'PartnerTypeSetup.ManualCode.cs'.
** Copy that file (e.g. by using the Context Menu entries 'Copy' and 'Paste') and rename the resulting file (e.g. by using the Context Menu entry 'Rename'):
*** The name of the file should be like the file name of your new yaml file, except that the file extension should be '.ManualCode.cs' instead of '.yaml'.
*** Example: if the new yaml file is called 'LocationTypeSetup.yaml', the new file name should be 'LocationTypeSetup.ManualCode.cs'.
*** Be very careful when renaming the file: the first part of the name needs to exactly match the name of the yaml file, and it needs to end 'exactly' in '.ManualCode.cs' - if it is named only slightly different, e.g. because of a spelling mistake or a space character that shouldn't be there, the WinForms Generator will not detect this file, which will lead to problems at compilation time or run time!
* Choose 'OK' to add the new '*.ManualCode.cs' file as a 'dependant item' to your form.

===Step 5c: Modifying the new '*.ManualCode.cs' file ===


===Step 5d: Compile C# Project ===
* Right-click on the C# Project you are working with and choose 'Build'.
** The IDE will compile any dependent projects and finally the C# Project you are working with.
** If no errors are shown, you can continue with the next step.
** If errors are shown, try to solve them by going again over the list of things that need to be changed in the *.ManualCode.cs file (Step 5c) and by checking for any general C# syntax errors. If you still get errors after getting rid of any errors you were able to fix for yourself, seek help from other openPETRA developers by posting your problem in the [http://apps.sourceforge.net/phpbb/openpetraorg/viewforum.php?f=3 Developer Area in the openPETRA Forum].

==Step 6: Adding the new screen to the openPETRA main menu structure==
* If you haven't got the following file still open, open it in a text editor (e.g. Notepad, Notepad++):
 U:\openpetraorg\csharp\ICT\Petra\Definitions\UINavigation.yml
* Decide where your new screen should show up in the Navigation in the openPETRA Main Window:
** We recommend that you start the openPETRA Client at that stage.
*** Have a look at the Module, Sub-Module, ''Setup Area'' and Tasks that you might have already in mind. Check what Tasks are already there and decide whether your new screen should be listed among the existing Tasks, or not. If not, keep on looking for a more suitable place in the menu structure, or, if you can't find one, decide on the name of a new Task Grouping in an existing 'Setup Area' that fits best.
*** Your new screen should usually be listed among Tasks of a fitting ''Setup Area''. If you think it should not go in a 'Setup Area', it is best to ask in the [http://apps.sourceforge.net/phpbb/openpetraorg/viewforum.php?f=3 Developer Area of the openPETRA Forum] for guidance.
* Scroll through the <code>UINavigation.yml</code> file until you find the Module, Sub-Module, Area, Task Group where your new screen should be listed.
* Choose any existing Task's text line in that Task Group and copy the whole text line.
* Paste the copied text line in the place where you want your new screen to show up.
** In case your screen should be displayed in a new Task Group, create a new Task Group by putting the name of the new Task Group in a separate line *before* the line of your new screen, followed by a colon (':'). Outdent (=the opposite of indent) the line for the new Task Group so that it starts in the same text column as other Task Groups do.
* Modify the pasted text line
** Change the text before the colon (':') so it reflects ''what'' your Maintain Table screen is maintaining. Leave out any space characters and capitalise the first letter of every word.
*** Example: if your new Maintain Table screen is maintaining 'Location Types', change the text to 'LocationTypes'.
** Change the text that follows 'Label=' to match how other Maintain Screens are showing up in the Task List.
*** Example: if your new Maintain Table screen is maintaining 'Location Types', change the text to 'Setup Location Types'.
** Change the text that follows 'Description=' to match how other Maintain Screens are described in the Task List.
*** Example: if your new Maintain Table screen is maintaining 'Location Types', change the text to 'Maintain Location Types'.
** Change the text that follows 'ActionOpenScreen' to match the ''Class Name'' of your new screen.
*** You can find out the Class Name by looking it up in the *.ManualCode.cs file: look for the line that starts with 'public partial class '. The text that follows that declaration is the Class Name of your new screen.
*** Example: if your new Maintain Table screen is maintaining 'Location Types', the Class Name is most likely 'TFrmLocationTypeSetup'.
* Close the openPETRA Client, if you have it open.

==Step 7: Opening the new screen in openPETRA for the first time :-)==
* Start the openPETRA Client.
* Go to the Module, Sub-Module and Setup Area to which you have added your new screen (in Step 6).
* Ensure that the Task for your new screen is listed, and that is in the Task Group that you want it in.
** If you can't see your new screen listed, check back in the <code>UINavigation.yaml</code> file to see where you put the text line that defines the Task for your new screen, and move the text line of your new screen to a text line of the Setup Area and Task Group that you wanted to see it appearing in. Restart the openPETRA Client to see if the change made the difference you wanted.
** If you still can't see your new screen listed where you want it to appear, seek help from other openPETRA developers in the [http://apps.sourceforge.net/phpbb/openpetraorg/viewforum.php?f=3 Developer Forum in the openPETRA Forum].
* Click on the Task for your new screen.
** Your new Maintain Table screen should open and display a list of entries.
*** If the screen opens: ''congratulations'', you have created and added your first Maintain Table screen to openPETRA ''':-)'''
*** If the screen ''does not'' open: check the Status Bar of the Main Window of openPETRA for a message. That message should help you in finding the problem.
**** The most likely cause for a screen not opening is that the Class Name and/or the Namespace in the <code>UINavigation.yaml</code> file are not correctly specified.
***** Check the Class Name in the text line that defines your new screen and correct it if it is wrong. If you corrected it, save the <code>UINavigation.yaml</code> file and restart openPETRA. Check whether the screen opens after this change.
***** Check the Namespace.
****** The Namespace of a screen is specified by the word 'Namespace=', followed by text that denotes the exact Namespace in which the screen is located. 
****** Ensure that the text that follows the word 'Namespace=' specifies the namespace of your screen: switch back to the SharpDevelop IDE and bring up the *.ManualCode.cs file. Search for the line that starts with 'namespace '. Check the text that follows and compare it with the text after the word 'Namespace='.
****** The word 'Namespace=' will most likely ''not'' appear in the text line that defines your new screen, but one or two steps higher in the hierarchy.
******* If it appears one or two steps higher in the hierarchy and it fits the namespace declaration of your screen's *.ManualCode.cs file, ensure that there is no 'Namespace=' defined in the text line that defines your new screen.
******* If it appears in the text line that defines your new screen, check that it is correct, and whether it is needed there at all - if the word 'Namespace=' appears one or two steps higher in the hierarchy and it fits the namespace declaration of your screen's *.ManualCode.cs file, then you should remove the 'Namespace=' declaration in the text line that defines your new screen because it is superfluous.
****** If you corrected the Namespace, save the <code>UINavigation.yaml</code> file and restart the openPETRA Client. Check whether the screen opens after this change.
*** If the screen does not open after your modifications (or the Class Name and the Namespace declarations in the <code>UINavigation.yaml</code> file seem to be right), seek help from other openPETRA developers in the [http://apps.sourceforge.net/phpbb/openpetraorg/viewforum.php?f=3 Developer Forum in the openPETRA Forum].

==Step 8: Iterations: adjusting to needs, re-generate screen, re-open screen==
* Once your new Maintain Table screen opens, it is time to check whether it produces the correct result by checking the following:
** Screen
*** Check that the screen's title is correct.
**** It should follow the format 'Maintain xxx', where 'xxx' is the name that the user knows for the entries of the DB table, in plural.
***** Example: if your new Maintain Table screen maintains 'Location Types', the screen's title should read 'Maintain Location Types'.
*** Check that the size of the screen is appropriate.
**** The width of the screen should be so that at least the first four columns are displayed without the need of scrolling to the right.
**** The height of the screen should be so that at least 15-20 rows are displayed, or, if there are generally less entries in the DB table, that there isn't too much empty room (no more than for 4-5 lines) at the bottom of the list.
** List
*** Check that all the columns are displayed that should be displayed.
*** Check that all the columns have correct Headings.
*** Check that all the columns have the correct display format (e.g. plain text, CheckBox, Date, etc.).
** Details section
*** Check that all the Controls are displayed that should be displayed.
*** Check that the Labels for all the Controls are correct.
*** Check that the layout of the Labels and Controls closely follows the layout of other, similar Maintain Table screens.
*** Check that appropriate Controls are used for the purpose: TextBoxes, CheckBoxes, RadioButtons, ComboBoxes, etc.
*** For ComboBoxes
**** Check that they are populated with the correct data items.
**** Check that any label text that might displayed to the right of the CheckBox isn't cut off (you might want to open the ComboBox to select the entry with the longest description for that). (If label text is cut off, you will need to specify the 'ColSpan' Attribute for the ComboBox where this is the case.)
*** If the DB table has a flag that is named something like 'Deletable', e.g. 'p_deletable_l' or 'p_type_deletable_l': the CheckBox for the flag should automatically be disabled, and automatically be ticked for new records. This is because a 'set' flag indicates 'System Records' that must not be deleted by the user. On the other hand, user's must not be allowed to create 'System Records'.
**** If the flag is called 'p_deletable_l', the disabling of the CheckBox should happen automatically. Please verify that this is the case.
**** If the flag is called something else than 'p_deletable_l', the disabling of the CheckBox needs to be done manually:
***** Add the following Attribute to the Control definition in the yaml file:
 Enabled=false
   '''or'''
 Enabled: false
** Buttons
*** Check that the 'New' Button and the 'New xxx' ToolBarButton work - they both should create a new record that has a default code.
**** The text of the 'New' Button should always be just 'New', with no further text.
**** The text of the 'New xxx' ToolBarButton should should follow the format 'New xxx', where 'xxx' is the name that the user knows for the entries of the DB table, in singular.
***** Example: if your new Maintain Table screen maintains 'Location Types', the text of the 'New xxx' ToolBarButton should read 'New Location Type'.
** Saving of data
*** Check that data that has been changed or added can be saved by
**** 1) clicking the 'Save' ToolBarButton,
**** 2) closing and re-opening your new Maintain Table screen,
**** 3) checking that the changed/added data is still there.

* If you noticed that something needs to change, go back to the screen's yaml file, make the necessary changes and save the file and run the Generator. Then check whether the changes have the desired effect on the screen in the openPETRA Client.
* If you need help with any necessary changes, seek help from other developers by posting your problem in the [http://apps.sourceforge.net/phpbb/openpetraorg/viewforum.php?f=3 Developer Area of the openPETRA Forum]. Provide as much detail as possible and attach the yaml file of your new Maintain Table screen.
* If you are not sure if the layout of the screen follows the standard that most Maintain Table screens follow, make a screenshot of your new screen and seek guidance from other developers by posting your problem in the [http://apps.sourceforge.net/phpbb/openpetraorg/viewforum.php?f=3 Developer Area of the openPETRA Forum]. Attach the screenshot and the yaml file of your new Maintain Table screen.
* Repeat the steps above until you are satisfied with the new Maintain Table screen.

Once you are happy with the appearance of the screen and how it works, you can move on to the next step!

==Step 9: Commit new screen's files to your local Git repository==
TODO

==Step 10: Integration of new screen into official openPETRA Git repository ==
There are two options, depending on whether you have or haven't write access to the official openPETRA Git repository.

''You can follow the instructions of 'Option B' only if you have write access to the official openPETRA Git repository.'' If you don't, then you have to follow the instructions of 'Option A'.

===Step 10, Option A: Creating a Git Patch and sending the Patch to the openPETRA core development team===
TODO

===Step 10, Option B: Pushing new screen's files to the openPETRA Git repository===
TODO