combobox duplicates

Giganews Newsgroups
Subject: combobox duplicates
Posted by:  F Verbeek (fv [at] tcenl [dot] com)
Date: Fri, 11 Mar 2005

How do you prevent adding duplicate strings to a combobox?
According to the D6 help file you should set the duplicates property of a
combobox to dupignore. But the property does not seem to exist.