Beamer nested Itemize

Question

currently I'm doing my first lecture with latex and beamer.

I have problems with using a nested itemize. On the first slide, everything should be visible respectively transparent. BUT: The nested itemize is fully invisible. If the slide with the upper point gets full visible, the nested itemize items get transparent. But I want to have them invisible the whole frame.

A example:

\begin{itemize}
\item<1-> First
    \begin{itemize}
        \item<2-> Sub-Itemize
        \item<3-> Sub-Itemize
    \end{itemize}
\item<4-> Second
    \begin{itemize}
        \item<5-> Again Sub-Itemize
        \item<6-> Again Sub-Itemize
    \end{itemize}
\end{itemize}

This is what I have:

This is what I want:

Answer 1

The second itemization is visible, just fainter then the first. You can adjust the opaqueness or use another transparency effect, see 17.6 Transparency Effects in the beamer user guide.

\documentclass{beamer}
\setbeamercovered{transparent=50}
\begin{document}

\begin{frame}
\begin{itemize}
\item<1-> First
    \begin{itemize}
        \item<2-> Sub-Itemize
        \item<3-> Sub-Itemize
    \end{itemize}
\item<4-> Second
    \begin{itemize}
        \item<5-> Again Sub-Itemize
        \item<6-> Again Sub-Itemize
    \end{itemize}
\end{itemize}

\end{frame} 

\end{document}