Correctly tear down menus.

Author: Hosch250

RetailCoder.VBE/UI/Command/MenuItems/ParentMenus/ParentMenuItemBase.cs

@@ -11,7 +11,7 @@
 
 namespace Rubberduck.UI.Command.MenuItems.ParentMenus
 {
-    public abstract class ParentMenuItemBase : IParentMenuItem
+    public abstract class ParentMenuItemBase : IParentMenuItem, IDisposable
     {
         private readonly string _key;
         private readonly int? _beforeIndex;
@@ -190,5 +190,15 @@ static public Image PictureDispToImage(IPictureDisp pictureDisp)
                 return GetPictureFromIPicture(pictureDisp);
             }
         }
+
+        public void Dispose()
+        {
+            foreach (var item in _items)
+            {
+                item.Value.Delete();
+            }
+            
+            Item.Delete();
+        }
     }
 }