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I am having the same issue; although I am using an ArrayCollection as the dataProvider.
Has someone else solved the problem of a filterable tree?
If you are sure that this is happening(I am surprised), and have looked other places on the net, I would advise a brute force recursive processing of the xml.
AS in-memory processing is blazingly fast and would support this for any reasonable size xml structure.
I'm having the exact same problem. filterfunction works great but it only filters the first level of the tree.
The HierarchicalCollectionView in datavisualization.swc propagtes the filtering to the child nodes. If you have FB pro you can try using that.