I would like to progressively develop a graph created with during a beamer presentation. Here is a MWE:
\documentclass{beamer}
\usepackage{tikz}
\usetikzlibrary{graphs, graphdrawing}
\usegdlibrary{layered}
\begin{document}
\begin{frame}
\begin{tikzpicture}
\graph[layered layout]
{%
"1" -- {"2", "3"},
{"2", "3"} -- "4",
% \only<2->{{"2", "3"} -- "4",}
{"2", "3"} -- "5",
% \only<3->{{"2", "3"} -- "5",}
{"4", "5"} -- "6",
% \only<4->{{"4", "5"} -- "6",}
};
\end{tikzpicture}
\end{frame}
\end{document}
The commented lines show my intent but they lead to errors.
Ty for any help.