Hi Daryl,
I scratched my head over this up here once... Here it wasnt actually tooltips in the treeview, but rather if the treeview isnt wide enough to show the full label, you get the tooltip effect. Try making your treeview wider or trimming blank spaces off of your node captions.
Roxanne M. Seibert
Independent Consultant, VFP MCP
Code Monkey Like Fritos