Performance issue when scrolling with radgridview and expanded Child tables

[Build-dude]

I am seeing some really terrible performance when scrolling the grid control and coming to the child grids.  Any suggestions on what I could do to make this scroll as well as the sections with out children?  I load my data and force all of the children to be expanded.  So there should be no computation from my code involved with this issue.( currently using q3 2010 beta )

   <telerik:RadGridView 
			ItemsSource="{Binding Fields}" 
			x:Name="FieldGridView" 
			AutoGenerateColumns="False" 
			CanUserInsertRows="False" 
			CanUserDeleteRows="False" 
			CanUserReorderColumns="False" 
			CanUserResizeColumns="False" 
			CanUserSelect="True" 
			CanUserSortColumns="False" 
			ClipboardCopyMode="Cells" 
			ShowGroupPanel="False" 
			SelectionMode="Extended" 
			SelectionUnit="Cell" 
			RowIndicatorVisibility="Collapsed" 
			ColumnWidth="*" 
			GridLinesVisibility="Horizontal" 
			EnableColumnVirtualization="True" 
            RowDetailsVisibilityMode="Collapsed" 
 
 
			ShowColumnHeaders="False"  
            RowLoaded="FieldGridViewChild_RowLoaded"
 
	>
        	<telerik:RadGridView.Background>
        		<SolidColorBrush/>
        	</telerik:RadGridView.Background>
            <telerik:RadGridView.ChildTableDefinitions>
                <telerik:GridViewTableDefinition />
            </telerik:RadGridView.ChildTableDefinitions>
 
            <telerik:RadGridView.HierarchyChildTemplate>
                <DataTemplate>
                    <telerik:RadGridView 
                        ItemsSource="{Binding Fields}"  
			            x:Name="FieldGridViewChild"  
			            AutoGenerateColumns="False" 
			            CanUserInsertRows="False"  
			            CanUserDeleteRows="False"  
			            CanUserReorderColumns="False"  
			            CanUserResizeColumns="False"  
			            CanUserSelect="True"  
			            CanUserSortColumns="False" 
			            ClipboardCopyMode="Cells" 
			            ShowGroupPanel="False" 
			            SelectionMode= "Extended" 
			            SelectionUnit="Cell" 
                        RowIndicatorVisibility="Collapsed" 
			            ColumnWidth="*" 
			            GridLinesVisibility="Horizontal" 
			            EnableColumnVirtualization="True" 
 
 
			            ShowColumnHeaders="False" 
                        >
                        <telerik:RadGridView.Columns>
                            <telerik:GridViewDataColumn 
                                Header="Id"
			                    DataMemberBinding="{Binding ID}"  
			                    DataFormatString=""  
			                    Width="40"  
			                    IsReadOnly="True"
			                    Background="#E5E5E5"
                                TextAlignment="Right"  />
                            <telerik:GridViewDataColumn
                                Width="*"  
                                
                                TextWrapping="Wrap"
                                DataMemberBinding="{Binding Value}" />
                        </telerik:RadGridView.Columns>
                    </telerik:RadGridView>
                </DataTemplate>
            </telerik:RadGridView.HierarchyChildTemplate>
 
 
 
            <telerik:RadGridView.Columns>
                <telerik:GridViewDataColumn
					Header="Id" 
					DataMemberBinding="{Binding ID}" 
					DataFormatString="" 
					Width="41" TextAlignment="Right"
					IsReadOnly="True"  
					Background="LightGray" />
                <telerik:GridViewDataColumn
					Width="*" 
					TextTrimming="None"
                    TextWrapping="Wrap"
					DataMemberBinding="{Binding Value}" />
            </telerik:RadGridView.Columns>
 
        </telerik:RadGridView>

[Vlad]

Hi,

 Please define Height for the child grid since HierarchyChildTemplate will measure by default controls with infinity. 

Best wishes,
Vlad
the Telerik team