I agree... IMO 3,500 root nodes is just too many for that type of control. I'd explore ways to get the root node size under a few hundred at most. That would be better from a usability standpoint as well as performance.

Greg



>>>In addition to what Jamie and Jordan advise, You could just populate the >root nodes, and wait to add the children when the root is expanded
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>>I tried that also, but there is 3500 root nodes and initialization of control is slow (2-3 min with Pentium II on client side).
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>3500 seems a lot of data for a busy user to deal with. Does your design need to present the entire universe, when [perhaps?], just a solar system or two will do.
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>What is the data?
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>>I can simulate treeview behavior with grid but I don't like solution like that.
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>>Infragistic control is too expensive for me. Is there some free control for specific task?