[Tex/LaTex] beamer overlays and table rules

beameroverlaystables

I am trying to use \only{...} within a table to selectively add blocks of lines. This works as long as I don't have a \midrule or \bottomrule included or following the part contained in \only{...}.

Why does this happen and is there a way to achieve this nevertheless?

An example follows:

\documentclass{beamer} 
\usepackage{booktabs}

\begin{document}
  \begin{frame}{Example}
    \begin{tabular}{ll}
      \toprule
        bla & bla \\
      \midrule
        A & A \\
        B & B \\  
        \only<1>{%
          \midrule  
            C & C \\
            D & D \\ }
      \bottomrule
    \end{tabular}

    \only<2>{Something else}
  \end{frame}

\end{document}

Best Answer

I managed to get it working with some carefully placed comments, see below for example. It seems that LaTeX doesn't like it when you place \\ and \*rule on different lines.

\documentclass{beamer} 
\usepackage{booktabs}

\begin{document}
  \begin{frame}{Example}
    \begin{tabular}{ll}
      \toprule
        bla & bla \\
      \midrule
        A & A \\
        B & B %  
        \only<1>{%
          \\\midrule  
          C & C %
        }%
        \only<2>%
        {%
        \\
        D & D  %
        }%
      \\ \bottomrule
    \end{tabular}
  \end{frame}

\end{document}
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