>What version of the treeview control are you using? The current one is v6.0 SP2. I had a similar problem with an ActiveX and it was causing the form and VFP to hang. On my system I have the option of two treeviews (v6 and v5). I have not tried v5 but it might cause this type of problem.

Its been a long time on this my appologies. I use the newer one - version six when font colors and full row select are important. I have to maintain that theme through out the project. But I like version 5 because it is a system OCX and therefore offers themes - but does not allow us to control for font color or have a full row select!

There is a project in downloads called "RIO" that may be helpful.