NotifyWPF

---------
CHG   Lot of plumbing, some fixes
CHG   Work on sample project.
CHG   Popups and ContextMenu now store coordinates - otherwise delayed opending may happen elsewhere.

git-svn-id: https://svn.evolvesoftware.ch/repos/evolve.net/WPF/NotifyIcon@55 9f600761-6f11-4665-b6dc-0185e9171623

Source/Sample Project/Commands/HideMainWindowCommand.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Windows;
+using System.Windows.Input;
+
+namespace Sample_Project.Commands
+{
+  /// <summary>
+  /// Hides the main window.
+  /// </summary>
+  public class HideMainWindowCommand : ICommand
+  {
+    public event EventHandler CanExecuteChanged;
+
+    public void Execute(object parameter)
+    {
+      Application.Current.MainWindow.Hide();
+      TaskbarIconCommands.RefreshCommands();
+    }
+
+
+    public bool CanExecute(object parameter)
+    {
+      return Application.Current.MainWindow.IsVisible;
+    }
+
+
+    /// <summary>
+    /// Raises the <see cref="CanExecuteChanged"/> event.
+    /// </summary>
+    internal void RaiseCanExcecuteChanged()
+    {
+      if (CanExecuteChanged != null) CanExecuteChanged(this, EventArgs.Empty);
+    }
+
+  }
+}