Pablo,

The Treeview is running in it's own window on top of your form, it doesn't know anything about the VFP form.LockScreen status. AFAIK there is no equivalent property on the control.

>I'm updating a large Treeview, and want to know how not allow to see how is generated.
>
>I tried with thisform.LockScreen, but still it is refreshing.
>
>Any suggest?