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     <oTopBar>: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 top bar menu.

        Hit Test Return Values
        ---------------------------------------------------------------------
        Value   Constant       Description
        ---------------------------------------------------------------------
        > 0     Not applicable The position in the top bar menu of the item
                               whose region the mouse is within
        0       HTNOWHERE      The mouse cursor is not within the region of
                               the screen that the top bar menu occupies
        -1      HTTOPLEFT      The mouse cursor is on the top-left corner of
                               the top bar menu's border
        -2      HTTOP          The mouse cursor is on the top bar menu's top
                               border
        -3      HTTOPRIGHT     The mouse cursor is on the top-right corner of
                               the top bar menu's border
        -4      HTRIGHT        The mouse cursor is on the top bar menu's right
                               border
        -5      HTBOTTOMRIGHT  The mouse cursor is on the bottom-right corner
                               the top bar menu's border
        -6      HTBOTTOM       The mouse cursor is on the top bar menu's
                               bottom border
        -7      HTBOTTOMLEFT   The mouse cursor is on the bottom-left corner
                               of the top bar menu's border
        -8      HTLEFT         The mouse cursor is on the top bar menu's left
                               border
        ---------------------------------------------------------------------

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

        hitTest() is a method of the TopBarMenu class that is used for
        determining if the mouse cursor is within the region of the screen
        that the Top bar menu occupies.