ArtOfTest.Common.Design.Exceptions.ExecutionException: The given key was not present in the dictionary. ---> System.Collections.Generic.KeyNotFoundException: The given key was not present in the dictionary.
   at System.Collections.Generic.Dictionary`2.get_Item(TKey key)
   at ArtOfTest.WebAii.Design.IntrinsicTranslators.Silverlight.Descriptors.TabControlSelectTabActionDescriptor.Execute(IApplication hostApp)
   at ArtOfTest.WebAii.Design.Extensibility.XamlActionDescriptor.Execute(IAutomationHost autoHost)
   at ArtOfTest.WebAii.Design.Execution.ExecutionEngine.ExecuteStep(Int32 order)
   --- End of inner exception stack trace ---