Resolved with lib version 2014.2.714.

GridViewCell.Errors - System.Collections.IEnumerable Errors { set; get; }

Errors collection always returns a collection of strings.  When using .NET 4.5 and INotifyDataErrorInfo the errors can be any type. In our case we are using a custom ValidationResult object that has different severity levels.

Because GridViewCell.Errors always returns strings and not the original underlying ValidationResult object our DataTemplate for ValidationResult is not applied.

Resolved with lib version 2014.2.0825.

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

The problem will be fixed with Q3 2014 official version.

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

The fix will be available with Q2 2015.

ArgumentNullException

The fix will be included in LIB version 2015.3.1026.

Fixed for GroupRenderMode="Flat".

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