The fix will be available with Q2 2015.

Add the "does not begin with" and "does not end with" to the list of filter parameters

RadGridView's FooterRow is still part of the visual tree, even though its Visibility is set Collapsed. 

With R2 2016 RadGridView will introduce ValidationType property that indicates what type of validation input should be processed(INotifyDataErrorInfo, IDataErrorInfo, DataAnnotations).

Resolved with lib version 2014.2.0825.

The problem will be fixed with Q3 2014 official version.

When only single cells have been selected and the grid is sorted/grouped, the selection of these cells is cleared. However, the SelectedCellsChanged event is not fired.