Rad Telerik Grid Filtering and Exporting.

I have telerik grid with rad filter <[login to view URL]> Task 1 I want to modify it so Categoires column can also be filterable but in radfitler it will show list of categories with checkboxes as shown in demo here but not only combobox but with checkbox combocox [login to view URL] Task 2 After filtering there will be one button click show all detail. I want to get all customers showing in grid its IDs and pass it into radwindow.