Wie kann ich über den Spalten einer Beamer-Präsentation eine Überschrift setzen?

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\documentclass{beamer}
\begin{document}
\begin{frame}
  \frametitle{Allgemeines Verwaltungsrecht, besonderes Verwaltungsrecht}
  \begin{columns}
    \column[T]{.50\textwidth}
    \textbf{AT}\smallskip
    \begin{itemize}
    \item Handlungsformen der Verwaltung
    \item Verwaltungsverfahren (VwVfG)
    \item Allgemeine Rechtsgrundsätze 
    \item Verwaltungsvollstreckung (VwVG)
    \item Staatshaftung
    \end{itemize}
    \column[T]{.50\textwidth} 
    \textbf{BT}\smallskip
    \begin{itemize}
    \item BauGB, LBauO
    \item GewO, GaststättenG
    \item BlmSchG, LImSchG
    \item u.\,v.\,m.
    \end{itemize}
  \end{columns}
\end{frame}
\end{document}
 
 
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