private void AddCommands()
 {
     CommandItems.Add(
         new DelegateCommandItem("Output", new DelegateCommand(() => _output.Show()))
     {
         Category      = "View",
         Icon          = MultiColorGlyphs.Output,
         InputGestures = new InputGestureCollection {
             new KeyGesture(Key.O, ModifierKeys.Control | ModifierKeys.Alt)
         },
         Text    = "_Output",
         ToolTip = "Show the Output window.",
     });
 }