wpf-notifyicon/Source/Sample Project/Commands/ShowSampleWindowCommand.cs

using System.Windows;
using System.Windows.Input;

namespace Samples.Commands
{
  /// <summary>
  /// Shows the main window.
  /// </summary>
  public class ShowSampleWindowCommand : CommandBase<ShowSampleWindowCommand>
  {
    public override void Execute(object parameter)
    {
      GetTaskbarWindow(parameter).Show();
      CommandManager.InvalidateRequerySuggested();
    }


    public override bool CanExecute(object parameter)
    {
      Window win = GetTaskbarWindow(parameter);
      return win != null && !win.IsVisible;
    }
  }
}