<oPopUp>: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 pop-up menu.

        Applicable Hit Test Return Values
        ---------------------------------------------------------------------
        Value   Constant       Description
        ---------------------------------------------------------------------
        > 0     Not Applicable The position in the pop-up 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 menu occupies
        -1      HTTOPLEFT      The mouse cursor is on the top left corner of
                               the pop-up menu's border
        -2      HTTOP          The mouse cursor is on the pop-up menu's top
                               border
        -3      HTTOPRIGHT     The mouse cursor is on the top right corner of
                               the pop-up menu's border
        -4      HTRIGHT        The mouse cursor is on the pop-up menu's right
                               border
        -5      HTBOTTOMRIGHT  The mouse cursor is on the bottom right corner
                               of the pop-up menu's border
        -6      HTBOTTOM       The mouse cursor is on the pop-up menu's bottom
                               border
        -7      HTBOTTOMLEFT   The mouse cursor is on the bottom left corner
                               of the pop-up menu's border
        -8      HTLEFT         The mouse cursor is on the pop-up menu's left
                               border
        -4098   HTSEPARATOR    The mouse is on a menu separator line
        ---------------------------------------------------------------------

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

        hitTest() is a method of the PopUpMenu class that is used for
        determining if the mouse cursor is within the region of the screen
        that the pop-up menu occupies.