or
Filtering on Distinct Values is not fully supported when using VirtualQueryableCollectionView. We suggest configuring with ShowDistinctFilters="False". That way only filtering through the Field Filters will be enabled. You can check the basic filtering section as a reference on the filtering support. There you can also find more information on how to filter through the Field Filters.<Style TargetType="Button" x:Key="ColorButtonStyle"> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="Button"> <Grid Height="25" Background="Transparent"> <Grid.RowDefinitions> <RowDefinition Height="0.664*" /> <RowDefinition Height="0.336*" /> </Grid.RowDefinitions> <TextBlock Text="Y" HorizontalAlignment="Center" Foreground="Red" /> <Rectangle Width="16" Margin="-2 0 0 0" Fill="{TemplateBinding Background}" Height="4.232" Grid.Row="1" VerticalAlignment="Top" /> </Grid> </ControlTemplate> </Setter.Value> </Setter> <Setter Property="Background" Value="Black" /> </Style> <Style TargetType="telerik:RadSplitButton" x:Key="SplitButtonStyle"> <Setter Property="ButtonPartStyle" Value="{StaticResource ColorButtonStyle}" /></Style><telerik:RadColorPicker SplitButtonStyle="{StaticResource SplitButtonStyle}"/><telerik:RadSplitButton Style="{StaticResource SplitButtonStyle}"/><telerik:RadGridView ItemsSource="{Binding Customers}" GroupRenderMode="Flat" AutoGenerateColumns="False" NewRowPosition="Bottom"> <telerik:RadGridView.ChildTableDefinitions> <telerik:GridViewTableDefinition/> </telerik:RadGridView.ChildTableDefinitions> <telerik:RadGridView.HierarchyChildTemplate> <DataTemplate> <Grid> <!-- If NewRowPosition = Top the row appear, otherwise hidden--> <telerik:RadGridView ItemsSource="{Binding Orders}" GroupRenderMode="Flat" NewRowPosition="Bottom"> </telerik:RadGridView> </Grid> </DataTemplate> </telerik:RadGridView.HierarchyChildTemplate> <telerik:RadGridView.Columns> <telerik:GridViewDataColumn DataMemberBinding="{Binding FirstName}" Header="Prenom"/> <telerik:GridViewDataColumn DataMemberBinding="{Binding LastName}" Header="Nom"/> </telerik:RadGridView.Columns>
</telerik:RadGridView>