GUIBaseContext :: doAfterHandleActivated - Post-event handler after activating control

The handler handles the DEV_Activated event, which is generated, when a control has been activated. When the event is fired, the property handle might not yet be opened, in which case data in the property handles cannot be accessed.

In contrast to doAfterHandleOpen(), the handler is called also, when the data source could not be opened successfully, but only, when activating the data source.

The event is typically used to select an instance in a collection as current instance to be processed by the application.

The event handler is also used in order to start transaction-save dialogs, in which case the event starts the transaction.