Why do slide transitions in beamer not work with XeLaTeX? [closed]

Question

I try to use some slide transitions in beamer with XeLaTex but it does not work. Why does this happens and how can I deal with it? But it works when I use slide transitions in beamer with PDFLaTeX. XeLaTeX was used for dealing with a lot of Chinese characters since it is flexible for font selection. Here is my MWE:

% !Mode:: "TeX:UTF-8"
\documentclass{beamer}
\usepackage{fontspec,xunicode,xltxtra}

\useoutertheme{infolines}
\usetheme{Darmstadt}

\begin{document}

\title{Example}
\institute{CUMT}
\author{xiao}


\begin{frame}
\frametitle{Example of Transboxin}
\transboxin
Frame Body Text
\end{frame}


\begin{frame}
\frametitle{Example of Transboxin}
\transboxin
Frame Body Text No2

It does not work. Do you see it?
\end{frame}
\end{document}

Any help will be really appreciated!

Well, if it can not be solved I will ignor slide transitions which do not affect my presentation.