Fires on the client side when the button receives input focus.
The GotFocus event's data class is ASPxClientEventArgs.
A button's GotFocus event is fired on the client when moving focus to the button from another control within the same page. Use the GotFocus event to perform specific client actions when the button obtains focus.
When a button loses focus, the ASPxClientButton.LostFocus event is raised.