gtk/widget.go
func (v *Widget) IsToplevel() bool {
	c := C.gtk_widget_is_toplevel(v.native())
	return gobool(c)
}
func (v *Widget) IsToplevel() bool {
	c := C.gtk_widget_is_toplevel(v.native())
	return gobool(c)
}
// IsToplevel is a wrapper around gtk_widget_is_toplevel().