nguyen, you've asked this question many times now, and several of us have answered it as best we can. The only thing we get back from you is "it didn't work". If you post the code in your option button CLICK event, or maybe tell us exactly what happens when you try our suggestions, we might be able to help, but at this point I'm inclined to think there is something elsewhere in your program that is causing problems. Everything that has been suggested SHOULD work...I've tried each of them, and they work for me.
Please help us to help you!
Ian