gtk/menu_shell.go
func (v *MenuShell) SelectItem(child IMenuItem) {
	C.gtk_menu_shell_select_item(v.native(), child.toWidget())
}
func (v *MenuShell) SelectItem(child IMenuItem) {
	C.gtk_menu_shell_select_item(v.native(), child.toWidget())
}
// SelectItem is a wrapper around gtk_menu_shell_select_item().