*
* If handle points to a Button the downcast produces valid
* handle. If not the returned handle is left uninitialized.
*
* @SINCE_1_0.0
* @param[in] handle Handle to an object
*
* If handle points to a Button the downcast produces valid
* handle. If not the returned handle is left uninitialized.
*
* @SINCE_1_0.0
* @param[in] handle Handle to an object