or


<Grid> <Grid.ColumnDefinitions> <ColumnDefinition Width="*" /> <ColumnDefinition Width="*" /> </Grid.ColumnDefinitions> <Controls:RadPanelBar ScrollViewer.HorizontalScrollBarVisibility="Disabled" ScrollViewer.VerticalScrollBarVisibility="Disabled"> <Controls:RadPanelBarItem> <Controls:RadTreeView Grid.Column="0" HorizontalAlignment="Stretch" Animation:AnimationManager.IsAnimationEnabled="False"> <Controls:RadTreeViewItem Header="1"> <Controls:RadTreeViewItem Header="2" /> <Controls:RadTreeViewItem Header="2" /> <!-- Insert items until the vertical scroll bar can scroll down --> </Controls:RadTreeViewItem> </Controls:RadTreeView> </Controls:RadPanelBarItem> </Controls:RadPanelBar> <GridSplitter Grid.Column="0" Width="3" HorizontalAlignment="Right" /> <Button Grid.Column="1">Test</Button> </Grid> 