Positioning of hyperlinked shapes with matrix in tikz - latex

Question

I can draw a hyperlinked shape in tikz using the following code:
\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{matrix}
\usepackage{hyperref}
\begin{document}
\begin{tikzpicture}
\node {%
\href{http://www.stackoverflow.com}{%
\begin{tikzpicture}
\filldraw[blue] circle(1cm) node [white] {Click};
\end{tikzpicture}}};
\end{tikzpicture}
\end{document}
Now I would like to organize my shapes using the matrix, and have one of the shapes hyperlinked. It almost works, but I am not able to align the hyperlinked shape with the rest of the shapes, and it is bigger than the other shapes:
\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{matrix}
\usepackage{hyperref}
\begin{tikzpicture}
\matrix [matrix of nodes, row sep = 1cm, column sep=1cm, nodes={circle, draw}]
{% First row:
1 & 2 \\
% second row:
\path node {\href{http://www.stackoverflow.com}{%
\begin{tikzpicture}
\node {3};
\end{tikzpicture}}}; & 4\\
};
\end{tikzpicture}
\end{document}
I get the following result:
(source: picture.im)
My question is: How could I align shape 3 in the picture above with the other shapes, and get rid of the outer circle?

Answer 1

I think you're aiming too high and your second {tikzpicture} is messing up your layout.
What do you think about the code below? Is that what you've been looking for?
\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{matrix}
\usepackage[pdftex,active,tightpage]{preview}
\PreviewEnvironment{tikzpicture}
\usepackage{hyperref}
\begin{document}
\begin{tikzpicture}
\matrix [matrix of nodes, row sep = 1cm, column sep=1cm, nodes={circle, draw}]
{%
1 & 2\\%
\href{http://stackoverflow.com}{3} & 4\\%
};
\end{tikzpicture}
\end{document}
BTW: the \PreviewEnvironment{tikzpicture} is not really needed, but it makes for a nice, cropped pdf...