Mapping Question

I have a TableView mapped to a textBrowser . when I move the mouse cursor into the tableView the textBrowser is append so after a few moves across the tableView the textBrowser will have multipule sets of the same (original) text.

this only happens when enough text is in the textBrowser to have a scrollbar.

is there a way to just update the textBrowser when the index of the tableView is changed, using mapping?

roger