\fi%
}%
\rput[tl](\dimexpr0.5\bcval@framesep+\mdf@middlelinewidth@length,%
- \dimexpr\mdfboundingboxheight-0.75\bcval@framesep-\mdf@middlelinewidth@length){\usebox\bc@envbox}%
+ \dimexpr\mdfboundingboxheight-0.75\bcval@framesep-\mdf@middlelinewidth@length){\box\bc@envbox}%
\rput[bl](\dimexpr\mdf@middlelinewidth@length+0.5\bcval@framesep,0){\bc@barre}%
\rput[bl](\dimexpr\mdf@innerleftmargin@length+\mdf@middlelinewidth@length,0){\box\tw@}%
\end{pspicture}%