Working With Bindable SelectedItems Collection in RadTreeView

3 posts, 1 answers
  1. Stacey Haslag
    Stacey Haslag avatar
    30 posts
    Member since:
    Oct 2009

    Posted 16 Feb 2011 Link to this post

    I am using the RadTreeView control for the first time. I am using the MVVM approach to interact with this control. What I want to do is be able to set and get the SelectedItems of the RadTreeView. I am allowing multiple selections to occur. I have the initial heirarchy list of business objects that I bind to the control. But I can't find a way to neatly interact with a collection of the selected items.

    I have read a lot of the various instructions in this area They lead me to using the ContainerBindingCollection and HierarchicalDataTemplate approach. So I have done this, and this is binding my collection of datasource business objects appropriately. 

    However, this still does not get me exactly what I want. Maybe it is not possible, but what I would like is a way to bind to the SelectedItem property, and receive a collection of selected items; and vice-verca to Set the SelectedItem list, and have the appropriate items selected.

    With the way that it is set up using the ContainerBindingCollection approach, I don't see a way to do that...would I have to build my own collection of selected items one-by-one as they select them?

    Here is my XAML:

    <telerik:ContainerBindingCollection x:Name="BindingsCollection">
                <telerik:ContainerBinding PropertyName="IsSelected" Binding="{Binding IsSelected, Mode=TwoWay}"></telerik:ContainerBinding>

    <telerik:RadTreeView Margin="0, 20, 0, 20" SelectionMode="{Binding SelectionMode}" ItemsSource="{Binding SortedTableOfContentsList}"
                                 SelectedItem="{Binding SelectedPage, Mode=TwoWay}">
                    <telerik:HierarchicalDataTemplate ItemsSource="{Binding RelatedPages}" 
                                                      telerik:ContainerBinding.ContainerBindings="{StaticResource BindingsCollection}">
                        <StackPanel Orientation="Vertical" VerticalAlignment="Bottom">
                            <TextBlock Text="{Binding Description}"></TextBlock>
                            <TextBlock FontSize="9" Text="{Binding Notes}" Margin="10, 0, 0, 0"></TextBlock>

    Notes: I do get all my heirarchy items to show in my tree list appropriately. I do have an "IsSelected" property added to my business object for binding. I am getting my "SelectedPage" property to fire in my view model for each item that is just fires one at a time as items are selected individually.


  2. Answer
    Petar Mladenov
    Petar Mladenov avatar
    2882 posts

    Posted 21 Feb 2011 Link to this post

    Hi Stacey Haslag,

    First I would like to note that in Extended selection mode, the SelectedItem is always the first item in the SelectedItems collection: SelectedItems[0]. However, could you please examine this blog post showing a possible way to synchronize the SelectedItems colelction with a collection of business items in the ViewModel.
    Please let us know if this approach fits in your scenario.

    Kind regards,
    Petar Mladenov
    the Telerik team
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  4. Stacey Haslag
    Stacey Haslag avatar
    30 posts
    Member since:
    Oct 2009

    Posted 04 Mar 2011 Link to this post

    Sorry for the late response to this! Yes, this scenario does fit my situation; I am now able to interact with the SelectedItems collection. Thanks for your help!

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