Cell gets out of the edit mode when new items are added in the collection. The same scenario works correctly if alternation is applied by RowStyleSelector. 

Rows get duplicated when SortDescriptors are applied and items are added to SelectedItems collection by a behaviour.

GridViewDataColumn.IsVisible binding is broken in a custom scenario. The problem is reproducible only in child GridView.

Resolved with lib version 2014.2.721.

You can not select different filtering options through keyboard navigation. The only possible way to select a filtering operator from the list with available filtering operators is to click on it.

The problem should be resolved with lib version 2016.1.125.

The NullReferenceException is observed when the GridView is Grouped and rebound in the CellEditedEnded event handler.

GroupFooterRowStyleSelector is not persisted, when you expand and collapse a group

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.