Hi Fred,
I had the same problem at the initilization of TreeView Control in VFP5.
The solution is in force a mouse click inside the control with MOUSE command
MOUSE CLICK AT thisform.oleTreeView.Top+1,thisform.oleTreeView.Left+1 ;
WINDOW (thisform.name)
Try this and tell me if work!
Good Luck
Lic. Esteban Bruno
Gerente de Sistemas
TASSO S.R.L.