Jaime

Thanks for your suggestion. I just tried that, i.e. setting _VFP.AutoYield = .F. in the Load method of the called form, containing the TreeView control. The result was the same:

The TreeView control in the called form will only respond to mouse and keyboard input if both the calling and called forms are Modeless. If either or both are modal, the TreeView control is unresponsive.

As I mentioned in my reply earlier today, I have tested this problem against a 2nd called form containing a TreeView control and do not observe it. In that case, the TreeView control is responsive with all combinations of caller/called and Modal/Modeless.

Jim