Vertical trees with TikZ

Question

Possible Duplicate:
Drawing a directory listing a la the tree command in TikZ

Is there a way to configure the trees drawn by TikZ to have child nodes at the same level listed below each other? Basically, I want something similar to the output of the tree command in a Command Prompt.

\documentclass{article}
\usepackage{tikz}

\begin{document}

\section*{TikZ tree}
\begin{tikzpicture}
\node {toplevel} 
    child { node {Foo}
            child { node {foo} }
            child { node {bar} }
            child { node {baz} }
    }
    child { node {Bar}
        child { node {foo} }
        child { node {bar} }
        child { node {baz} }
    }
    child { node {Baz}
        child { node {foo} }
        child { node {bar} }
        child { node {baz} }
    };
\end{tikzpicture}

\section*{Desired tree structure}
\begin{verbatim}
toplevel
|-- Foo
|   |-- foo
|   |-- bar
|   `-- baz
|-- Bar
|   |-- foo
|   |-- bar
|   `-- baz
`-- Baz
    |-- foo
    |-- bar
    `-- baz
\end{verbatim}

\end{document}