After extending the Application Model with incorrect schema, ModelEditor cannot be opened, even if I remove incorrect code

Hi Anatol
please do the following

1. Create a new modele
2. at a new view controller add
      public override Schema GetSchema()
           {
               string CommonTypeInfos = @"<Element Name=""Application"">
                       <Element Name=""BOModel"" >
                           <Element Name=""Class"" >
                               <Element Name=""HiddenControlllers"">
                                   <Element Name=""Item"" KeyAttribute=""Name"" DisplayAttribute=""Name"" Multiple=""True"">
                             <Attribute Name=""Name"" IsReadOnly=""true"" IsLocalized=""False"" RefNodeName=""/Application/ActionDesign/Controllers""
                                           Required=""True""/>
                        </Element>
                               </Element>
                           </Element>
                       </Element>
                   </Element>";
               return new Schema(new DictionaryXmlReader().ReadFromString(CommonTypeInfos));
           }
3. Build module and save the new solution file
   4.Double clicke Model and editor opens
   5.Go to Application/BOModel/AboutInfo Node and right click and choose Add HiddenControllers
   6.Go to Application/BOModel/AboutInfo/HiddenControllers right click and choose add item
   7.Check that the name attribude combobox does not have the required values cause of a wrong schema implementations
   8.Close Model editor without saving
   9.Double click the Model Editor again and u get the exception
   10.Close the solution
   11.reopen the solution and double click the Model the exception is still there
   12.close the solution and delete the solution file (*.sln)
   13.Open the cproj file and the exception dissapear
   hope u can reproduce that

Hello Apostolis,
Thank you for your instructions, it allowed me reproduce the problem. In my opinion the fact that the Model Editor cannot be opened for the incorrectly extended model is not a bug. But the problem is that after removing incorrect code, the Model Editor still cannot be opened, and this behavior looks incorrect. We are working on this problem, and will provide you a solution ASAP.
Thanks,
Anatol

Hello Apostolis,
We've found the cause of the problem. When you close the Model Editor, the last focused node is saved, and when you try to open the ME again, it cannot set focus to this node, because the schema is incorrect. It causes the exception. When you close the solution, the last focused node is saved to the *.suo file, that's why deleting this file fixes the problem. Unfortunately, we cannot provide you with a workaround. Currently, if you need to extend the schema, I suggest that you remove focus from the unchecked nodes when you close the Model Editor, to avoid this problem.
Thanks,
Anatol