i have one interface with a combo box and list box. when i select a category in the combo box, the list box will list out the name within the selected category.when i double click or select the name, it will open out another screen showing the details of the selected name. my problem is, when i close the combo box screen, and i opne it again, the list box will duplicate the name i selected before, for example i choose AMY, when i closed and re- open it there will be 2 AMY, it just duplicate and record name, what should i do.......thank you in advanced