We use
\begin{lstlisting}
&&\\*[-0.9em]
\end{lstlisting}
to add vertical space between the table lines. In the last table
line we use
\begin{lstlisting}
&&\\*
\end{lstlisting}

In the \textit{ChoiceMenu\/} we set the ``popdown=true'' parameter
to establish popdown-behaviour.\\
The parameter ``width=20em'' parameter sets the horizontal size.
\lstinputlisting{../examples/ex0003.tex}