Although VB’s SSTab control behaves as if each tab page is a container, it actually uses a single container for all tab pages. This can cause unexpected behavior if you have groups of option buttons on different pages. Clicking on an option button on one page clears all the uncontained option buttons on the other, seemingly unrelated, pages. Solve this problem by adding your own containers (frames or picture boxes) for each group of options you want to be mutually exclusive.