RE: Filter on Selected List
Now I opened the form and noticed that it already implements filtering by name. Isn't it what you want?
If you want more advanced filtering capabilities (the current logic implemented in the form is indeed limited), then my recommendation is using a grid. Grids are great for filtering.
You can implement anything you like, of course, but if you want standard methods, you should probably change your design.
You didn't respond to my questions about tags. Please make sure you don't attach unrelated tags next time; I'll clean them up in this thread.