Designing the Procedure Logic › GUI Event Processing › Windows and Window Controls That Signal Events › OPEN GUI Event

OPEN GUI Event

An OPEN event is triggered just before a window or dialog box is to be displayed. It can be used to perform any window or dialog box initialization before the window or dialog box is displayed.

OPEN can be triggered for the following actions:

• At initial module start up
• As the result of a flow
• Execution of an explicit OPEN statement as part of the procedure logic
• Selecting a push button or menu item with the result of initializing a dialog box

For example, to open a dialog box containing a list of departments, the procedure logic can include an OPEN statement.

An OPEN event handler contains statements to populate the list as shown in the next sample code. The list box for departments is then populated just before the Department dialog box is opened.