Assigned to user i want to show role based list

Assigned to user or user related field i want to show role based or security group based.
How to bring that list in populate window. Please suggest how to do.

Did you find the solution …?

No, but I have done based on role name hide and showcased in that page. This is not proper solution. Do you have any other solutions.

Almost I had crack this but facing some issues. For more please go through this Url Show User According To Role