Hi Saravana Kumar,
That is very strange. I have prepared a sample project and the event is fired normally for any kind of type. You can check this in the Output Window where a Debug.WriteLine message will be posted after you add the first filter. It will be for the Name property which is a string. Run the project and check it out.
Please, take the sample project and modify it so that it reproduces the behavior that you are faced with. Then open a separate support ticket and attach the modified sample project. We will examine it and see what is wrong.
We are looking forward to hearing from you.
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