Hi dear all, I have a optional group with 3 buttons and one list box. my query has 4 fields: A1, A2, A3, A4. I want to know if that possible to show A1&A2 in the list box after click the optional group button1, and then if I click optinal button2, field A2&A3 will shows in my list box, and so on. How do I write the code? Hope anyone can help me, Thanks!