RadTreeView inside RadPanelBarItem not virtualizing

[Brian Nguyen]

I have a RadPanelBar with one RadPanelBarItem that contains a RadTreeView with IsVirtualized="True". While the RadTreeView is inside the RadPanelBarItem, the virtualization is not working (it takes about 7 seconds to load 500 items). However, if I take the RadTreeView out of the RadPanelBar, virtualization works (it takes about 1 second to load 500 items).

I assume it is similar to putting a RadTreeView inside of a ScrollViewer because it's childen have infinite space and therefore disables virtualization. How can I overcome this issue?

Thanks in advance,

Ryan

[Miroslav]

Hello Brian Nguyen,

Yes, you are correct. The PanelBar contains a ScrollViewer in its template and its panel acts as StackPanel (which does not limit the height of its children even if it exceeds its own height).

Is setting a (Max)Height on the TreeView an option for you? Alternatively you need to disable the vertical scrolling  in the PanelBar.

Regards,
Miroslav
the Telerik team

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[Brian Nguyen]

Thanks!

I was able to set the MaxHeight of my RadTreeView by binding it to the ActualHeight property of the parent UserControl.

MaxHeight="{Binding ElementName=UserControlName, Path=ActualHeight}"

* You must set the x:Name="UserControlName" on your UserControl for the above binding to work.

[Karl]

Brian,

Thanks, this helped me out and is a very elegant solution.