The control is a small rectangle (check box) that contains an X when the user selects it. The specified text is displayed to the right of the check box. An X appears in the square when the user first selects the control and disappears the next time the user selects it. The AUTOCHECKBOX statement, which can only be used in a DIALOG or WINDOW statement, defines the text, identifier, dimensions, and attributes of a control window. The predefined class for this control is WC_BUTTON. If the style is not specified, the default style is BS_AUTOCHECKBOX and WS_TABSTOP.