Thank you for your reply. The example you provided will involve much changes in my side as I have 40 columns and I would like to avoid using radcombo or listbox .. instead of my current gridboundcolumn. That's fine we settled with using multiple methods to achive this scenario.
I have found one more issue in Excel like filtering grid. When select few checkbox and click 'filter' it works fine. But once user tries to reopen the same column and click 'Clear Filter' button . It is not unchecking the checkbox selected by user before. I see that your online demo is working fine but I am not able to replicate that clearing in my side.
Question 1: Is there a way for me to Handle the 'ClearFilter' event in codebehind (or) client side .
Question 2 : I only want to clear the selected column filter not other remaining columns.
Question 3 : When I click 'Filter' button - radgrid filters but I don't get to see the loading image. Which shows up on other operations.
Please find the code .. Removed few lines . Please help. Using Vs 2015 enterprise , ,net 4.5.01055
Telerik : v4.0.30319 , version : 2015.3.1111.45 , Telerik UI for ASP.NET AJAX
ADMIN: Code removed upon OP request.