rowstyle isexpandable

3 posts, 1 answers
  1. Tim Ge
    Tim Ge avatar
    16 posts
    Member since:
    May 2010

    Posted 26 Apr 2011 Link to this post


    I have set up a rowstyle for my radtreelistview,
    however, the rows without any children are still displayed without the expand arrow infront of them

    the reason for this is because I have implemented the loadondemand or lazy loading function using MVVM in the control
    in order to make all the rows expandable, i have put a dummy child in each row's view model object
    however, this throws me object not initialised error when I tried to filter the rows

    the code below describe how i set up the rowstyle

        <Style TargetType="{x:Type telerik:TreeListViewRow}">
            <Setter Property="IsExpandable" Value="True" />
            <Setter Property="IsExpanded" Value="{Binding IsExpanded, Mode=TwoWay}" />
            <Setter Property="IsSelected" Value="{Binding IsSelected, Mode=TwoWay}" />
            <Setter Property="FontWeight" Value="Normal" />
                <Trigger Property="IsSelected" Value="True">
                    <Setter Property="FontWeight" Value="Bold" />

    please can you advise what was wrong? note I don't want to set IsExpandable as shown in the treelistview loadondemand demon as I'm using MVVM and want to keep the code behind clean

    btw, I'm using radcontrol q1 2011


  2. Answer
    Vlad avatar
    11100 posts

    Posted 27 Apr 2011 Link to this post


     Binding to both properties (IsExpandable and IsExpanded) is not supported currently - you can check this thread for more info. You can still use similar to our on demand demo logic with MVVM if you create custom attached behavior - for example like this demo

    Both the forum thread and the demo are for Silverlight however in WPF the situation is exactly the same. 

    Kind regards,
    the Telerik team
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  3. Tim Ge
    Tim Ge avatar
    16 posts
    Member since:
    May 2010

    Posted 27 Apr 2011 Link to this post

    Thanks for the reply,
    so looking forward for the performance optimization in q2 2011
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