Treeview Hang on Dragging

dragging onto a xul tree that has a treeview defined hangs the browser. I’ve defined the nsITreeView function canDrop and it returns true always. /-:

UPDATE: I defined getParentIndex (nsITreeView), but didn’t implement it, this function has to be implemented for a drop operation and must return -1 if the row has no parent. agh.

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