Microsoft.Phone.Controls.ContextMenu.OnKeyDown C# (CSharp) Method

        protected override void OnKeyDown(KeyEventArgs e)
        {
            if (e == null)
            {
                throw new ArgumentNullException("e");
            }

            switch (e.Key)
            {
                case Key.Up:
                    FocusNextItem(false);
                    e.Handled = true;
                    break;
                case Key.Down:
                    FocusNextItem(true);
                    e.Handled = true;
                    break;
                case Key.Escape:
                    ClosePopup();
                    e.Handled = true;
                    break;
                // case Key.Apps: // Key.Apps not defined by Silverlight 4
            }
            base.OnKeyDown(e);
        }