Concatenating 2 ObservableCollections in TreeListBoxItemAdapter.GetChildren

Hi John,

It might be that our built-in collection handling logic doesn't recognize CompositeCollection.  Could you put together a new simple sample project that shows what you're trying to do and maybe a quick mockup of how it should look and send that to our support address so we can look into it?  Be sure to remove any bin/obj folders from what you send and rename the .zip file extension so it doesn't get spam blocked.  Thanks!

I've sent a project to the support address. Just to clarify - CompositeCollection might be one way to accomplish what I want - basically to have items from 2 different collections at the same level in the tree, but I'm totally open to other suggestions as well.

Hi John,

Thanks for the sample.  The problem was that CompositeCollection is an IEnumerable of CollectionContainer objects and not the actual data items.  Thus when we iterate it to look for data items, we are getting your CollectionContainer objects.  What we really need you to bind to as a source data item enumerable is this:

_AllView = ((ICollectionViewFactory)_All).CreateView();

If you cache that view result as a field alongside your _All field and return the view in your MyAdapter.GetChildren method, it will work since now our logic will look at the actual data items and not yoru CollectionContainer objects.

That works. Thanks!