Feature request:
It would be nice if the FlyTreeView created content that was valid XHTML. I validate with HTMLTidy as a FireFox plugin, and it gives me the following issues:
Warning: isn't allowed in elements
Warning: attribute "id" has invalid value "__NRSL_(My tree view UniqueID)"
These don't affect how the TreeView functions, but they do mask other validation errors in my page, so can be a nuisance to work around.
The ID issue shoud be easy to fix (in XML IDs can't start with an underscore value). The style issue is probably harder to fix, since I gather it's output dynamically based on the tree generation.