RadTreeView DLLs upgrade from V2009 to V2011 - Things not working the same

4 posts, 0 answers
  1. Merav
    Merav avatar
    4 posts
    Member since:
    Aug 2011

    Posted 10 Aug 2011 Link to this post

    I'm experiencing now the trial version of Telerik.Windows.Controls DLL V2011, in order to decide whether to upgrade from V2009,
    and unfortunately encountered several problems which I'll appreciate your help solving them.

    1. Can't select nodes in the hierarchical tree from code behind if the node isn't in the view,
    Because the TreeViewItem is null after trying getting it from the ItemContainerGenerator:
    var treeItem = (RadTreeViewItem)control.ItemContainerGenerator.ContainerFromItem(myVMObject);

    And I'm using virtualizing

    VirtualizingStackPanel.IsVirtualizing="True"  VirtualizingStackPanel.VirtualizationMode="Recycling"

    2. When sometimes the TreeViewItem is not null, then trying to bring it into view, the previous code no longer works.
                            ItemsControl control = treeView;
                            var treeItem = (RadTreeViewItem)control.ItemContainerGenerator.ContainerFromItem(myVMObject);
                            if (treeItem != null)
                                    treeItem.IsSelected = true;
                                    treeItem.IsExpanded = true;                          

    3. By clicking on a node and then switching to other node,
    sometimes the last clicked node, even that is selected, not visualy looks like selected,
    and the previous one looks like it still selected.


    Thanks in advance,

  2. Petar Mladenov
    Petar Mladenov avatar
    2882 posts

    Posted 15 Aug 2011 Link to this post

    Hi Merav,

    Regarding the first two issues, you can try to use the BringPathIntoView method. You can explore this blog post which is very good starting point. Please let us know if you need further assistance on this.
    As for the "selection issue" is it possible for you to tell us the exact steps in reproducing this behavior, do you succeed to reproduce it in our demos here ? Thank you for your cooperation. 

    Petar Mladenov
    the Telerik team

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  4. Merav
    Merav avatar
    4 posts
    Member since:
    Aug 2011

    Posted 24 Aug 2011 Link to this post

    Hi Petar ,
    Thanks for your reply,
    The BringPathIntoView method does work, can you tell me why the previous way no longer works?
    Is it because of the Virtualizing? I want to mention that I used it already with the old version.
    Any way, the problems that remain unsolved are two:
    1. The Expand and Collapse of a specific node that is selected are not always work,
        It's not consistent and I can't give a specific scenario for it.
    2. The focus problem also not consist and I can't give any scenario for it too, 
        But sometimes a node is selected, and you click on another node, 
        And even that the second node is now the selected one (The right pane is showing it's details),
        Both nodes looks like selected.

    I hope you'll be able to assist me,
  5. Petar Mladenov
    Petar Mladenov avatar
    2882 posts

    Posted 29 Aug 2011 Link to this post

    Hello Merav,

     Is it possible for you to isolate the issues in a sample project so that we would be able to investigate them better? There are some known issues when the tree is virtualized and selection or focus-related issues but we need more info or code (or captured video) in order to confirm that your issues are known bugs. Thank you for your cooperation and understanding. 

    Petar Mladenov
    the Telerik team

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