Thank you for writing.
I strongly encourage you to not use the hosted control feature of RadTreeView as it is only feasible for root nodes without child nodes and when there are no scroll bars. Currently RadTreeView uses our old layout system which completely disregards the hosted control property and only uses a very small set of node layout properties. This property will be hidden in the Q2 2010 release and will probably be made obsolete soon after. I am afraid that there is nothing we can suggest at this time to work around this problem, except to figure out another way of displaying your data. I am sorry for this turnaround. This problem will be addressed in the next major version of RadTreeView.
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