I don't know why it happens, but it happened to me, too. The three radio buttons of a radio button group were aligned with the same Y coordinate. When I pressed tab to navigate to the radio button group, the middle radio button was selected. After slightly raising the first radio button and slightly lowering the third radio button, I pressed tab, and the first radio button was selected. I also found that more significantly raising the first radio button caused the first radio button to be selected; however, it was not as aesthetically pleasing. My thanks to @jimmypham who submitted an answer on Oct 11, 2005 2:40 PM to the following problem: Re: Tabbing order with Radio Buttons & Text Boxes.