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RadTreeView as DragCue

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paul orsillo
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paul orsillo asked on 25 Oct 2010, 07:34 PM
I have a RadTreeView bound to a datasource (ObservableCollection<MyType>). When a child is dragged I want to show  the child and its immediate parent hierarchy in the dragcue. This chain may be a few levels deep. 

So for example if I select child c3 (with parent b3 who has parent a3) I would like the dragcue to show a treeview with 
--a3
    -- b3
         -- c3

This tree would actually be the same if I were to start by selecting a3 or b3. So in short I am dragging the entire local hierarchy.

I have the radtreeview and data structure for the dragcue implemented and loaded into a content control. My problem is that the tree is collapsed even though I call ExpandAll() on the dragcue treeview. I am using a HierarchicalDataTemplate and the treeiview appears to know that it has children (there is a  drop down indicator indcating that there is another level).

It looks like the RadTreeView wants to do the right thing but I am missing something. 

Is what I am trying to do possible? 

Thank you,

Paul

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Tina Stancheva
Telerik team
answered on 28 Oct 2010, 06:09 PM
Hi paul orsillo,

You can use ContainerBindings to bind the IsExpanded property of the RadTreeViewItems inside the DragCue to an appropriate business property. Please have a look at the attched example illustrating a similar scenario and let us know if you need more info.

All the best,
Tina Stancheva
the Telerik team
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paul orsillo
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answered on 28 Oct 2010, 09:01 PM
Thank you Tina.

This is exactly what I needed and really quite simple. 

Paul
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Tina Stancheva
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paul orsillo
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