\usepackage {pstcol}
\definecolor{pink}{rgb}{1, .75, .8}
\begin{pspicture}(0,0)(4.5,2)\showgrid
  \psframe[linestyle=dashed]
          (0.5,0.5)(3,1.5)
  \psframe[fillstyle=solid,fillcolor=pink]
          (.5,0)(4.5,1)
  \psframe[fillstyle=solid,fillcolor=white,
          framearc=0.5](3,0.2)(3.8,0.8)
\end{pspicture}