A radio button, also known as an option button, is a small, round button with a label next to it. The label may be text, an icon, or a bitmap. A user can select a radio button by tapping it with the stylus. Radio buttons are usually grouped together in a group box, representing a set of related, but mutually exclusive options. When a user selects a radio button, all other radio buttons in the same group are automatically cleared.
Radio button
When the user selects an automatic radio button, Windows CE automatically sets the check state of all other radio buttons within the same group to unchecked. For standard radio buttons, use the WS_GROUP style to achieve the same effect.