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IM_HITTEST returns true if a point is within the image.  The Intuition
function PointInImage() uses this method.  IM_HITTEST requires the
following parameters:

    struct impHitTest
        ULONG MethodID;
            WORD X;
            WORD Y;
        } imp_Point;

The mytextlabelclass example blindly passes this method on to its
superclass.  The superclass, imageclass, will return TRUE if the point is
within the old Image structure box.

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