%% 
%%  A DANTE-Edition example
%% 
%%  Example 17-03-3 on page 281.
%% 
%%  Copyright (C) 2011 Herbert Voss
%% 
%%  It may be distributed and/or modified under the conditions
%%  of the LaTeX Project Public License, either version 1.3
%%  of this license or (at your option) any later version.
%% 
%%  See http://www.latex-project.org/lppl.txt for details.
%% 
%% 
%% ==== 
% Show page(s) 1
%% 
\documentclass[]{article}
\pagestyle{empty}
\setlength\textwidth{225.70511pt}
\setlength\parindent{0pt}

\usepackage{pst-tree}

\begin{document}
\psset{tpos=.6}%  60% of the start
\psframebox[fillstyle=solid,
  fillcolor=black!15]{%
\pstree[treemode=R,thistreesep=0.7cm,
   shortput=nab,nrot=:U,
   thislevelsep=3cm,
   radius=2pt]{\Tc{3pt}~{A}}{%
  \pstree[treemode=U,xbbr=20pt]{%
    \Tc{3pt}~{B}^{top}}{%
        \TC~*{B1}^{left}
        \TC*~*{B2}_{right}}
  \TC~*{C}\ncput*{centre}
  \pstree[treemode=D,xbbr=20pt]{%
    \Tc{3pt}~{D}_{bottom}}{%
        \TC~*{D1}_{left}
        \TC*~{D2}^*{right}}
}}
\end{document}
