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I have some sample code here: http://work.dropdead.org/filebrowser/

when you highlight a node then mouseover the span that says "Mouseover for Node" it always returns null instead of a reference to the node, what am I doing wrong? Should i be doing something completely different to get the selected/highlighted node?
I'm setting singleNodeHighlight to true as per api reference:

getHighlightedNode
YAHOO.widget.Node getHighlightedNode ( )
When in singleNodeHighlight it returns the node highlighted or null if none. Returns null if singleNodeHighlight is false.

Returns: YAHOO.widget.Node
a node reference or null

thank you for your answer I've made some headway!

ok now this is weird maybe, but now when I "highlight" with a single click it doesn't visually highlight the node anymore but if you do the mouseover it returns an object reference so it's working now ... except without the visuals, I tried adding

tree.setNodesProperty('enableHighlight', true);

but it didn't help, what else am I missing?

ok got it now, thank you.
I'm sure I'll have more treeview questions when I get to dynamic display.