func (v *Button) SetAlignment(xalign, yalign float32) {
	C.gtk_button_set_alignment(v.native(), (C.gfloat)(xalign),
		(C.gfloat)(yalign))
}
func (v *Button) SetAlignment(xalign, yalign float32) {
	C.gtk_button_set_alignment(v.native(), (C.gfloat)(xalign),
		(C.gfloat)(yalign))
}
// SetAlignment() is a wrapper around gtk_button_set_alignment().