title: DataGridView columns disappears after set custom ColumnType
body: <p>I've created a custom IDataGridViewEditingControl (and related column and cell). When I choose this type in the Edit Columns dialog and click on OK button all the columns in the datagridview will be disappeared. The form.Designer.cs file won't contains any column so my idea is that an exception occurs during the code generation but the designer hide it.</p>
  
  <p>I tried to debug with help of another instance of VS (Debug / Attach to process: devenv.exe) but I couldn't find the problem in my code. Is there any way to get the exception from? Is there any detaileg VS log where I can find these hidden exceptions?</p>
  
  <p>Environment is VS2013 (tried with Express for Desktop and Professional)</p>
  
  <p>Thanks,
  Loti</p>