I understand from http://docs.telerik.com/devtools/wpf/controls/radpropertygrid/features/validation, that there are essentially two methods to implement data validation in a RadPropertyGrid.  Note that I would like to use the "property set" feature of RadPropertyGrid whereby I can display/edit properties from multiple items simultaneously (http://docs.telerik.com/devtools/wpf/controls/radpropertygrid/features/defining-propertysets).

I was only able to get the second validation technique (data annotations) to work when using property sets.  Should the first technique (IDataErrorInfo) work with the property sets feature?  Towards the end of the discussion here http://www.telerik.com/forums/validation-bfd78b274562, this topic is touched on, but it is not clear if it was ever resolved.

If it is not possible to use the IDataErrorInfo technique with property sets, I suggest the documentation at http://docs.telerik.com/devtools/wpf/controls/radpropertygrid/features/validation be updated to reflect this fact.  Separately, is there a target date for when this feature may be added?

If it is possible to use the IDataErrorInfo technique with property sets, would someone kindly post a sample solution?

BindingMode is OneWay when there is editor template and PropertySetMode is None

Resolved with LIB version 2014.1.407.

 Provide a straight-forward option for customers to set their custom tooltip. An example showing how to achieve this now is available at https://github.com/telerik/xaml-sdk/tree/master/PropertyGrid/CustomHyperlinkToolTip

The problem should be resolved with R2 2016. 

The fix is available with lib version 2015.2.907.

Fixed with LIB version 2015.2.817.

SearchTextBox is clipped, when SortAndGroupButtonsVisibility property of RadPropertyGrid is set to Collapsed, in Windows8Touch theme

The item status is set to Declined as it is already logged in our system: https://feedback.telerik.com/Project/143/Feedback/Details/202982-propertygrid-selectedpropertydefinitions-are-not-cleared-when-radpropertygrid-it.

When the Expression_Dark theme is applied to the RadPropertyGrid, selecting an item is hard to read, as the item's foreground is white and the selection state is in a similar color.

To work this around, use the following Style:

<Style TargetType="telerik:PropertyGridField">
    <Style.Triggers>
        <Trigger Property="IsSelected" Value="True">
            <Setter Property="Foreground" Value="Black"/>
        </Trigger>
    </Style.Triggers>
</Style>