rowstyle isexpandable

[Tim Ge]

Hi,

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

<telerik:RadTreeListView.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" />
        <Style.Triggers>
            <Trigger Property="IsSelected" Value="True">
                <Setter Property="FontWeight" Value="Bold" />
            </Trigger>
        </Style.Triggers>
    </Style>
</telerik:RadTreeListView.RowStyle>

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

Cheers

[Vlad]

Hello,

 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,
Vlad
the Telerik team

[Tim Ge]

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