[Tex/LaTex] Latex beamer: How to horizontally/vertically center text, ignoring other content

Question

I would like to put some content, for example a beamercolorbox exactly in the middle of the page (horizontally/vertically centered) and then some other content on the bottom of a frame. Centering just the colorbox is easy:

\begin{frame}[plain]
  \vfill
  \begin{beamercolorbox}[center]{title}
     example text
  \end{beamercolorbox}
  \vfill
\end{frame}

How can I now insert some more content at the bottom without disturbing the vertical alignment?

Any help is appreciated!

Answer 1

May be it's a little bit overkill but it works. Compile twice to watch the result.

\documentclass{beamer}
\usepackage{tikz}

\begin{document}
\begin{frame}[plain]
\begin{tikzpicture}[overlay, remember picture]
\node[anchor=center] at (current page.center) {
\begin{beamercolorbox}[center]{title}
     example text
  \end{beamercolorbox}};
\end{tikzpicture}
\end{frame}
\end{document}