TActiveButton is the active control counter part to
When a TActiveButton is clicked, rather than a normal post back request a
callback request is initiated. The OnCallback event is raised
during a callback request and it is raise after
the OnClick event.
When the ActiveControl.EnableUpdate property is true,
changing the Text property during a callback request will update
the button's caption on the client-side.
Since the OnCallback event is raised only during a callback request,
the OnCallback event handler can be used to handle logic specifically
related to callback requests. The OnClick event handler is raised
The following example the use of both the OnClick and OnCallback
events of an TActiveButton.