Function PrintButtonActions

* Print button actions. * Call this function after PrintInfo(). * * If any button action is NULL, that button won't be displayed. * * @param btn_home [in,opt] Home button action. * @param btn_a [in,opt] A button action. * @param btn_b [in,opt] B button action. * @param btn_x1 [in,opt] X/1 button action. */