I would like to have the entire node part a link. But, it seems that once you rotate, hyperref has issues. The reference below say to place the rotated content in the hyperlink, but not sure how to do that when using Tikz's nodepart:

Notes:
- The links work fine if
\def\VerticalText{}is commented. - Ideally, I'd prefer the entire rectangular region to be a link, but having just the text would be acceptable.
References
- How to rotate hyperlink with text
- How to make pgfplots vertical labels have proper hyperref erence box?
- Hyperref box does not obey slant
Code:
\def\VerticalText{}% <--- All links work if comment this out.
\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{shapes}
\usepackage[colorlinks=true]{hyperref}
\ifdefined\VerticalText
\tikzset{My Rotate/.style={rotate=90}}%
\else
\tikzset{My Rotate/.style={}}%
\fi
\tikzset{Node Label Style/.style={
anchor=south,
above,
align=center,
}
}
\tikzset{Rectangle Split Style/.style={
rectangle split, rectangle split parts=3,
My Rotate,
anchor=south,
thick, fill=gray!10,
}
}
\tikzset{Node Part Style/.style={draw, minimum width=2.1cm, align=center}}
\newcommand*{\GoogleLink}{\href{http://www.google.com}{\shortstack{Google \ Web Site}}}%
\begin{document}
This multi-line link works: \GoogleLink
The link in the title also work:
\bigskip
\begin{tikzpicture}
\node[Rectangle Split Style] (MyNode) at (0,0) [Node Part Style]
{\nodepart{one} \GoogleLink %% <-- This link does NOT work if \VerticalText is defined
\nodepart{two} \shortstack{Yahoo \ Web Site}
\nodepart{three} \shortstack{TeX.SE \ Web Site}
};
\ifdefined\VerticalText
\coordinate (Title Location) at (MyNode.east);
\else
\coordinate (Title Location) at (MyNode.north);
\fi
%% This link works fine:
\node [Node Label Style] at (Title Location) {\GoogleLink};
\end{tikzpicture}
\end{document}

rectangle split. Then the remaining is not TikZ anymore. – Symbol 1 Jul 05 '15 at 13:12