/// <summary> /// This is the method that responds to the KeyDown event. /// </summary> /// <param name="e">Event arguments</param> protected override void OnKeyDown(KeyEventArgs e) { base.OnKeyDown(e); if (e.Handled) { return; } Key key = e.Key; switch (key) { case Key.Down: case Key.Up: if (CurrentSelection != null) { // Only for non vertical layout Up/Down open the submenu Panel itemsHost = ItemsHost; bool isVertical = itemsHost != null && itemsHost.HasLogicalOrientation && itemsHost.LogicalOrientation == Orientation.Vertical; if (!isVertical) { CurrentSelection.OpenSubmenuWithKeyboard(); e.Handled = true; } } break; case Key.Left: case Key.Right: if (CurrentSelection != null) { // Only for vertical layout Left/Right open the submenu Panel itemsHost = ItemsHost; bool isVertical = itemsHost != null && itemsHost.HasLogicalOrientation && itemsHost.LogicalOrientation == Orientation.Vertical; if (isVertical) { CurrentSelection.OpenSubmenuWithKeyboard(); e.Handled = true; } } break; } }