To allow the user to select one of these three states, we are going to use the Radio Button control associated with the "Status" item of "Orders" data file.


	Remark	The radio buttons are also called "option box". They are used to select a single option among the proposed ones. How to differentiate between a radio button and a check box? We will only refer to option boxes as "Radio buttons". An easy way to remember: think of old radios: a single frequency could be selected via the button! The radio button is used to select a single option.

To create the Radio Button control:
1. Display the "Analysis" pane if necessary: on the "Home" pane, in the "Environment" group, expand "Panes" and select "Analysis". The different data files described in the "WD Full Application" analysis appear in the pane.
2. Click the icon next to the "Orders" data file: the items found in the data file are listed.
3. Select the "Status" item in the Orders data file, then drag and drop this item into the "WIN_Menu" window
4. The Radio Button control is automatically created. Position this control above the Table control.

We are now going to pass the value selected in the Radio Button control in parameter to the query:
1. Display the WLanguage events associated with the Table control:
  - Select the Table control.
  - Open the popup menu (right click) and select "Code".
2. In the "Initializing" event of the Table control, replace the line:
  //MySource.ParamStatus = <Value of ParamStatus>
  with the following WLanguage code:
  MySource.ParamStatus = RADIO_Status
  In this code, RADIO_Status is the name of the Radio Button control that was just created. The value of this control is associated with the ParamStatus parameter expected by the query.
3. Close the code editor.

Before running the test, we are going to create a Button control to re-display the content of Table control according to the value selected in the Radio Button control:
1. Create a Button control:
  - on the "Creation" pane, in the "Usual controls" group, click .
  - then click on the "Finding orders" pane of the Tab control, at the top right.
2. Select the control and press Enter. The control caption becomes editable. Type "Find" and press Enter on the keyboard.
3. Modify the control style:
  - Display the popup menu of control (right mouse click) and select "Choose a style".
  - In the window that is displayed, press Ctrl + F. In the search control, type "BTN_Search".
  - The style is automatically selected. Validate.
4. Resize the control if necessary.
5. Display the WLanguage events associated with this control: press F2.
6. Write the following WLanguage code in the "Click..." event:
  // Refreshes the display of Table control
  TableDisplay(TABLE_QRY_FindOrders, taInit)
  In this code, the taInit constant is used to re-run the "Initializing" event of the Table control (the event in which the parameters are passed to the query).
7. Close the code editor.

We are now going to check how the first parameter is passed:
1. Save the window by clicking among the quick access buttons.
2. Click among the quick access buttons.
3. Select the "Finding orders" tab pane if necessary.
4. Change the status of orders with the radio button and click "Find". The content of Table control is modified.
5. Close the test window.