We found several forums raising the same issue but no clue and concrete solution was provided. Most of the solutions asked to uninstall the visual studio extension that causes the problem which is not a solution as we have to use the extension. I had a strong sense that the problem should be root caused from WPF dialog. With this sense, a thorough analysis and reasoning figured out the solution which I am sure will help several Visual Studio extension developers, product developers to solve similar problems.