The grips on the scrollbar's thumb is blurred on 120dpi as well as some of the borders.

As it turns out, we hit a WPF specific problem with 120 DPI. The issue is similar to the following:
http://connect.microsoft.com/VisualStudio/feedback/details/798513/wpf-dpi-rendering-issues-with-two-borders
For the time being this issue is not addressed and most probably would not be fixed. 

The first character is lost on typing in a column with CellEditTemplate with 
RadMaskedNumericInput, RadMaskedCurrencyInput, RadMaskedDateTimeInput, RadMaskedTextInput.

This Style is not applied when Windows8 Theme is set for the GridView (only) - it works if an ApplicationTheme is set. 
<telerik:RadGridView  telerik:StyleManager.Theme="Windows8" Name="clubsGrid" .../>

<Style TargetType="telerik:GroupHeaderRow" telerik:StyleManager.BasedOn="Windows8">

<Setter Property="ShowGroupHeaderColumnAggregates" Value="True" />

<Setter Property="Background" Value="Red"/>

</Style>

There are two different styles for the Validation Message - the Microsoft's and the Telerik's.

Let your data column have a cell style with DataTrigger which sets the Tooltip depending on the value:

<telerik:GridViewDataColumn.CellStyle>
    <Style TargetType="telerik:GridViewCell">
        <Style.Triggers>
            <DataTrigger Binding="{Binding StadiumCapacity}" Value="42055">
                <Setter Property="ToolTip" Value="THIS IS TOO SMALL" />
                <Setter Property="Background" Value="Red" />
            </DataTrigger>
        </Style.Triggers>
    </Style>
</telerik:GridViewDataColumn.CellStyle>

Initially, when the grid loads - the tooltips are set correctly. But if you edit a cell and change its value to 42055 then the background is set to Red (as expected), but the tooltip does not update.

Add a bindable property to RadGridView which would allow the selection to be manipulated in MVVM scenarios.

I have a RadGridView with RadLinearSparkLines as a column showing ~100 trends.  I am looking to save all sparklines when I save screenshot.
I tried by querying the RadGridView for desired size after a call to Measure(), and pass it to the Arrange().  However, the RadGridView renders within the bounds of its actual size but not the desired size.  I also noticed that the desired size is not as tall as the size required to render all rows.
Is there any way I can save RadGridView as PNG with all rows rendered in the image?

Thanks in advance for any tips!

ValidationErrorHandler does not get invoked when validating in view mode and System.ComponentModel.INotifyDataErrorInfo interface is implemented.

The workaround could be using QueryableCollectionView instead. Still, it does not suggest the exact same functionality as ICollectionView.

We are using Radgridview in our wpf application which is autogenerated using Class Models. When the number of columns are quite huge(more than 35-40 columns), the performance of the horizontal scrollbar is quite poor and even worst when the data on the Grid is huge. Infact the experience it gives while scrolling seems as if the scrollbar is continuously growing. I have tried the following settings on the RadGridView in the xaml but there is no significant improvement in the performance:

EnableColumnVirtualization="True" EnableRowVirtualization="True" VirtualizingPanel.IsVirtualizing="True" VirtualizingPanel.VirtualizationMode="Recycling" ScrollViewer.CanContentScroll="False" ScrollMode="Deferred"

RadGridView is consuming resources when its IsBusy property is set to False in Windows8, Windows8Touch, Office2013 themes. 

Available in LIB version 2017.1.206 , it will be also available in the R1 2017 SP1 Release.

Resolved with lib version 2014.2.0825.

When RadGridView is grouped by a column with ShowColumnWhenGrouped property set to False and GroupDescriptors are cleared, the column does not get visible.