Application Users - include roles

Hi. I am trying to include a list of assigned roles alongside the Application user list. Ideally, I want to be able to filter users by assigned roles. All attempts failing. Anyone achieved this?
Many thanks

Here is a possible approach. I'm using as an example the Load event in Application Users page:

Thanks Vladimir - this was my initial approach. However, I can find no way to populate the RoleNames for this to work.

You are right, RoleNames is populated only for the current user. Here is how to extend the security service with partial method that can be used later in the UI:

Many thanks for this! I am unable to see this extension as an available data source method - although I can manually code it (i.e. can see the extension and returns required data). Any trick I have missed to get this to appear as an available data source?
Cheers

This is custom method I wrote in a partial class to illustrate you how to achieve your goal. You can extend your security service in the same way.

No working perfectly. Many thanks!