Customized Radgrid filter as rad combo box for autogenerated columns true

Thanks Eyup. 

I made the columns invisible but I will try your sample solution and will let you know the result.

But meanwhile, I noticed the error I posted in this thread "Radgrid Date column swapped century and year values 2015 as 1520" - http://www.telerik.com/forums/radgrid-date-column-swapped-century-and-year-values-2015-as-1520