ActionSource
From Xojo Documentation
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The ActionSource interface is implemented by Timer, DesktopBevelButton and DesktopButton. An ActionSource object calls the PerformAction method of each ActionNotificationReceiver registered with it.
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Notes
If you implement this interface in your application, you must implement the methods with the parameters as shown here.
Example
If you want to have a Button call PerformAction on an ActionNotificationReceiver then you would create a new class (perhaps ActionNotificationTest) that implements ActionNotificationReceiver. In the PerformAction method, you add the code you want to run when the button is pressed (and before DesktopButton.Pressed is called). For example:
Now in the Opening event handler for a Button, you can add your receiver:
When the button is pressed, the MessageBox is displayed.