The control highlights the circle and sends a message to its parent window when the user selects the button. The control removes the highlight and sends a message when the button is next selected. The RADIOBUTTON statement defines the text, identifier, dimensions, and attributes of a control window. The predefined class for this control is WC_BUTTON. If you do not specify a style, the default style is BS_RADIOBUTTON.
Use the RADIOBUTTON statement only in a DIALOG or WINDOW statement.