<oCheckBox>:hitTest(<nMouseRow>, <nMouseCol>)
        --> nHitStatus

        <nMouseRow> is a numeric value that indicates the current screen row
        position of the mouse cursor.

        <nMouseCol> is a numeric value that indicates the current screen
        column position of the mouse cursor.

        Returns a numeric value that indicates the relationship of the mouse
        cursor with the check box.  hitTest() is a method of the CheckBox
        class that is used for determining if the mouse cursor is within the
        region of the screen that the check box or its caption occupies.

        Applicable Hit Test Return Values
        ---------------------------------------------------------------------
        Value     Constant    Description
        ---------------------------------------------------------------------
        0         HTNOWHERE   The mouse cursor is not within the region of
                              the screen that the check box occupies
        -1025     HTCAPTION   The mouse cursor is on the check box's caption
        -2049     HTCLIENT    The mouse cursor is on the check box
        ---------------------------------------------------------------------

        Button.ch contains manifest constants for the hitTest() return value.