RadTreeView inside RadPanelBarItem not virtualizing

4 posts, 0 answers
  1. Brian Nguyen
    Brian Nguyen avatar
    9 posts
    Member since:
    Sep 2009

    Posted 24 May 2010 Link to this post

    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,

  2. Miroslav
    Miroslav avatar
    922 posts

    Posted 25 May 2010 Link to this post

    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.

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  4. Brian Nguyen
    Brian Nguyen avatar
    9 posts
    Member since:
    Sep 2009

    Posted 25 May 2010 Link to this post


    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.
  5. Karl
    Karl avatar
    12 posts
    Member since:
    Jan 2011

    Posted 24 Feb 2011 Link to this post


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