[pstricks] closed Shadow in pscustom

[vin.gui]

Hello,

I am using pscustom and \closedshadow.
But closedshadow always fills my curve.
Is this unavoidable ? 
Do I use the correct syntax?

Thanks very much
 _______
\begin{pspicture}(0,0)(10,10)

\pscustom[fillstyle=none,shadowcolor=lightgray]{
\psbezier(0,0)(1,1)(1,-1)(2,0)
\psbezier(2,0)(3,1)(1,1)(2,2)
\closepath 
\closedshadow 
}

\rput(5,0){
\pscustom[fillstyle=none,shadowcolor=lightgray,fillcolor=red]{
\psbezier(0,0)(1,1)(1,-1)(2,0)
\psbezier(2,0)(3,1)(1,1)(2,2)
\closepath 
\closedshadow 
}
}

\end{pspicture}




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