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