[Tex/LaTex] Draw line below frame title in beamer

beamerrules

How can I draw a line just below the title of the frame using the beamer class? I want a clear separation between the title of the frame and the content of the frame. Also, I want the block environment to be shaded in blue. The LaTeX code I'm using is

\documentclass[10pt]{beamer}
\mode<beamer>{%
\usetheme[hideothersubsections,
right,width=22mm]{Goettingen}
 }
\title{Math}
\author[Mister X]{X}
\institute{University}
\titlegraphic{\includegraphics[width=20mm]{USTL}}
\date{January 15, 2012}

\begin{document}
\begin{frame}<handout:0>
\titlepage
\end{frame}
\begin{frame}\frametitle{part 1}
 The following proposition is easy to prove.
\begin{block}{Proposition}
 some statement
 \end{block}

\end{frame}
\end{document}

Best Answer

You could do it with TikZ, referring to the current page node:

\usepackage{tikz}
\newcommand{\topline}{%
  \tikz[remember picture,overlay] {%
    \draw[blue] ([yshift=-1cm]current page.north west)
             -- ([yshift=-1cm,xshift=\paperwidth]current page.north west);}}
...
\begin{frame}\frametitle{part 1}
  \topline
  ...
\end{frame}

line in frame

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