func (v *HeaderBar) SetCustomTitle(titleWidget IWidget) {
	C.gtk_header_bar_set_custom_title(v.native(), titleWidget.toWidget())
}
func (v *HeaderBar) SetCustomTitle(titleWidget IWidget) {
	C.gtk_header_bar_set_custom_title(v.native(), titleWidget.toWidget())
}
// SetCustomTitle is a wrapper around gtk_header_bar_set_custom_title().