System.Windows.Controls.SelectorSelectionAdapter.HandleKeyDown C# (CSharp) Method

        public void HandleKeyDown(KeyEventArgs e)
        {
            switch(e.Key)
            {
                case Key.Enter:
                    OnCommit();
                    e.Handled = true;
                    break;

                case Key.Up:
                    SelectedIndexDecrement();
                    e.Handled = true;
                    break;

                case Key.Down:
                    if((ModifierKeys.Alt & Keyboard.Modifiers) == ModifierKeys.None)
                    {
                        SelectedIndexIncrement();
                        e.Handled = true;
                    }
                    break;

                case Key.Escape:
                    OnCancel();
                    e.Handled = true;
                    break;
            }
        }