I'm performing a flowchart using pstricks . The problem is how to do superimposed Boxes (in gray and light gray ) included in the flow chart like those in the picture below . Is there any specific function to produce that ?
This is what I've done so far
\begin{psmatrix}[rowsep=0.4,colsep=0.5]
\psovalbox[fillstyle=solid,fillcolor=yellow,shadow=true]{Begin} \\
\psframebox[shadow=true]{Initialisations} \\
\psdiabox[fillstyle=solid,fillcolor=Pink,shadow=true]{Special} &
\psframebox[shadow=true]{1)} & \psframebox[shadow=true]{2)} \\
\psframebox[shadow=true]{Action 1} \\
~\\
\psframebox[shadow=true]{Action 2} \\
\psovalbox[fillstyle=solid,fillcolor=yellow,shadow=true]{End}
% Links
\ncline{->}{1,1}{2,1}
\ncline{->}{2,1}{3,1}
\ncline{->}{3,1}{4,1}<{\textcolor{red}{No}}
\ncline{->}{4,1}{6,1}
\ncline{->}{6,1}{7,1}
\ncline{->}{3,1}{3,2}^{\textcolor{red}{Yes}}
\ncline{->}{3,2}{3,3}
\ncbar[angleA=-90,armB=0,nodesepB=0.25]{->}{3,3}{4,1}
\end{psmatrix}
Thank You for your help in advance .