I have a form with 2 combo boxes. One box presents a list of SSNs and the other a list of Last names. How do I clear a previous selection? For example, I click SSN 111111111 which returns data for that SSN. Later I click the second combo box, Last Name Smith. I want to clear the combo box containing 11111111 because Smith's SSN is not 11111111. How do I clear the last selection to prevent confusion?