Mine

                [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
                public bool IsHandleCreated {
                        get {
-                               if ((window != null) && (window.Handle != IntPtr.Zero)) {
-                                       Hwnd hwnd = Hwnd.ObjectFromHandle (window.Handle);
-                                       if (hwnd != null && !hwnd.zombie)
-                                               return true;
-                               }
+                               if (window == null || window.Handle == IntPtr.Zero)
+                                       return false;

-                               return false;
+                               Hwnd hwnd = Hwnd.ObjectFromHandle (window.Handle);
+                               if (hwnd != null && hwnd.zombie)
+                                       return false;
+
+                               return true;
                        }
                }