Microsoft.Windows.Controls.Ribbon.RibbonMenuButton.OnKeyDown C# (CSharp) Метод

        protected override void OnKeyDown(KeyEventArgs e)
        {
            RibbonHelper.HandleDropDownKeyDown(this, e,
                    delegate { return IsDropDownOpen; },
                    delegate(bool value) { IsDropDownOpen = value; },
                    RetainFocusOnEscape ? _partToggleButton : null,
                    _popup.TryGetChild());

            // Do not call base because base's logic interferes
            // with that of RibbonMenuButton.
            // base.OnKeyDown(e);

            if (e.Handled)
                return;

            OnNavigationKeyDown(e);
        }