This function is EXPERIMENTAL. The behaviour of this function, the name of this function, and anything else documented about this function may change without notice in a future release of PHP. Use this function at your own risk.
Sets the action to be performed when the button is clicked.
This is a shortcut for SWFButton->addAction() called with the SWFBUTTON_MOUSEUP flag.
An SWFAction, returned by SWFAction->__construct().