how to create report filter like the default "Availability Report"

Hey Guys, I am trying to create some customised reports, since this is a multi-tenancy environment, I want to create a report filter on the top of the reports, when we want a report for a specific group ( customer group), we can easily select the group then click generate, all the default report template under "Performance report" have that, but I have no idea how are they created and we can't simply copy them and edit.

I've also attach a screenshot here, this is exactly what I need to create in my customised reports.

http://i1068.photobucket.com/albums/u443/hhe2015/zenoss/report%20filter_...

Thanks a lot,
Hubery