gtk/gtk.go
func (v *Button) SetLabel(label string) {
	cstr := C.CString(label)
	defer C.free(unsafe.Pointer(cstr))
	C.gtk_button_set_label(v.native(), (*C.gchar)(cstr))
}
func (v *Button) SetLabel(label string) {
	cstr := C.CString(label)
	defer C.free(unsafe.Pointer(cstr))
	C.gtk_button_set_label(v.native(), (*C.gchar)(cstr))
}
// SetLabel() is a wrapper around gtk_button_set_label().