Benachrichtigungen verschwinden nicht mehr einfach

ChatController/ChatMainControl.xaml.cs

@@ -24,6 +24,7 @@ using ChatController.HauptKlassen;
 using ChatController.LoginKlassen;
 using ChatController.Utilities;
 using ChatController.Utilities.Extensions;
+using Application = System.Windows.Forms.Application;
 using Button = System.Windows.Controls.Button;
 using Cursors = System.Windows.Input.Cursors;
 using DataFormats = System.Windows.DataFormats;
@@ -244,10 +245,11 @@ namespace ChatController
 
                 SelectContact(_ContactList.FirstOrDefault(f => f.GroupId.Equals(pGroupId)));
             };
-
+            
             notifyIcon.BalloonTipClosed += (sender, args) =>
             {
-                DisposeAndRemoveNotification((NotifyIcon)sender, pGroupId);
+                // TODO: wird beim ausblenden bzw. automatischem Schließen des "Balloons" ausgelöst
+                //DisposeAndRemoveNotification((NotifyIcon)sender, pGroupId);
             };
 
             _Group2NotifyIcons.AddOrUpdateValueInDictionary(pGroupId, notifyIcon);
@@ -261,7 +263,9 @@ namespace ChatController
             {
                 foreach(var notifyIcon in group2NotifyIcon.Value)
                 {
+                    notifyIcon.Icon = null;
                     notifyIcon.Dispose();
+                    Application.DoEvents();
                 }
             }
 
@@ -272,6 +276,9 @@ namespace ChatController
         {
             pNotification.Dispose();
             _Group2NotifyIcons.Remove(pGroupId);
+
+
+            Application.DoEvents();
         }
 
         public void ResetStyle()