>There was a bug with VFP that the ListBox would not respond at all if there were ListBoxes on multiple Pages. I'd have to see what the fix was that could be done for that.
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>The only workaround I ever found for that one was to add a method that moved the listboxes on the inactive pages off the visible protion of the page and move the lsibox on the active page back to its original position on activate.

well.. feel free to add another brand new one.. Almost 100% of chances to be a bug.. My code was clear and easy to understand.. Wasn't there others influences (as deactivations or cleanup codes of others objects)

To solve for now, I change the listbox to grid.. and, all the things start to run fine.. Even better.. How grid has become in few years from bad to a great guy.. This is what we call some "very nice restoration program"<g>

Tks to all