Possible bug with setting IsCheck property in style definition

3 posts, 1 answers
  1. Alex Galie
    Alex Galie avatar
    22 posts
    Member since:
    Dec 2009

    Posted 21 Mar 2011 Link to this post


    I'm trying to set checked state of TreeView items based on a bool property in the databound objects as described here (for WPF): http://www.telerik.com/help/wpf/radtreeview-how-to-bind-selected-item.html

    This doesn't seem to work in Silverlight. The workaround for this is to use the CheckState property instead and create a converter but I'd rather bind to a bool property, it's just cleaner like that.

    I've created a simple project around this issue with just a TreeView but it won't let me attach it so here's the XAML:

    <UserControl x:Class="SilverlightApplication1.MainPage"
        d:DesignHeight="300" d:DesignWidth="400">
            <telerik:HierarchicalDataTemplate x:Key="TreeTemplate" ItemsSource="{Binding Children}">
                <StackPanel Orientation="Horizontal">
                    <TextBlock Text="{Binding Name}" Margin="2" VerticalAlignment="Center" />
            <Style TargetType="telerikNavigation:RadTreeViewItem" x:Key="TreeItemStyle">
                <Setter Property="IsExpanded" Value="True" />
                <!-- THOSE DON'T WORK -->
                <Setter Property="IsChecked" Value="True" />
                <!--<Setter Property="IsChecked" Value="{Binding Path=IsVisible}" />-->
                <!-- THIS WORKS -->
                <!--<Setter Property="CheckState" Value="On" />-->
                <Setter Property="HorizontalAlignment" Value="Left" />
            <Grid x:Name="LayoutRoot" Background="White">
            <telerikNavigation:RadTreeView x:Name="LayerTree"
                                           ItemTemplate="{StaticResource TreeTemplate}"
                                           ItemContainerStyle="{StaticResource TreeItemStyle}"
                                           ItemsSource="{Binding Path=Layers}"
                        <TextBox Text="{Binding Name, Mode=TwoWay}" />
  2. Answer
    Petar Mladenov
    Petar Mladenov avatar
    2882 posts

    Posted 22 Mar 2011 Link to this post

    Hi Alex Galie,

    Binding a container property to a property of your ViewModel (business object) cannot be achieved with Style in Silverlight 4 (Probably it will be possible in SL5). For this purpose, we have created ContainerBindings. You can also find more info and comparison of IsChecked/CheckState in this blog post.Additionally you can examine the attached project where the basic approach is implemented.

    Petar Mladenov
    the Telerik team
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  4. Alex Galie
    Alex Galie avatar
    22 posts
    Member since:
    Dec 2009

    Posted 22 Mar 2011 Link to this post

    Thanks Petar, I didn't know that :)
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