gtk/gtk.go
func (v *Container) ChildGetProperty(child IWidget, name string, valueType glib.Type) (interface{}, error) {
	gv, e := glib.ValueInit(valueType)
	if e != nil {
		return nil, e
	}
	cstr := C.CString(name)
	defer C.free(unsafe.Pointer(cstr))

	C.gtk_container_child_get_property(v.native(), child.toWidget(), (*C.gchar)(cstr), (*C.GValue)(unsafe.Pointer(gv.Native())))
	return gv.GoValue()
}
func (v *Container) ChildGetProperty(child IWidget, name string, valueType glib.Type) (interface{}, error) {
	gv, e := glib.ValueInit(valueType)
	if e != nil {
		return nil, e
	}
	cstr := C.CString(name)
	defer C.free(unsafe.Pointer(cstr))

	C.gtk_container_child_get_property(v.native(), child.toWidget(), (*C.gchar)(cstr), (*C.GValue)(unsafe.Pointer(gv.Native())))
	return gv.GoValue()
}
// ChildGetProperty is a wrapper around gtk_container_child_get_property().