addActionTarget = "[String] widget name, [Constant] event,[Method] execute method" [String] is the name of the widget [Constant] the event to listen on [Method] the method signature
An action is a higher level event abstraction.
It is triggered by different lower level events.
The button gets the action Event invoked when a mouse released event occurs WHILE the mouse is still
within the boundaries of the button control
it is invoked on a key released event WHILE the button still is in focus.
To demostrate the action event we will create a clear an Edit control.