[Orgmode] Org-beamer and beamer overlays

[Glyn Millington]

Good Morning :-)

I'm having trouble getting beamer overlays to work properly when
producing slides via org-mode. This may well be due to my not
understanding the documentation!!    


I can only get this to work by dropping down into LaTeX - which on this
scale is pretty painless - but feel sure there must be a way to do this
org too.  Can anyone show me how? 

Below are the headers for my beamer-slide template and a frame with
overlays which works.

If it helps, this is Emacs-23.2.1 and org-mode 7.01h

With thanks


Glyn



8<------8<------8<------8<------8<------8<------8<------8<------8<------

#+TITLE:     Beamer slide template
#+AUTHOR:    GM
#+EMAIL:     address@hidden
#+DATE:      2010-08-24
#+DESCRIPTION: 
#+KEYWORDS: 
#+LANGUAGE:  en
#+OPTIONS:   H:3 num:t toc:nil \n:nil @:t ::t |:t ^:t -:t f:t *:t <:t
#+OPTIONS:   TeX:t LaTeX:t skip:nil d:nil todo:t pri:nil tags:not-in-toc
#+INFOJS_OPT: view:nil toc:nil ltoc:t mouse:underline buttons:0 
path:http://orgmode.org/org-info.js
#+EXPORT_SELECT_TAGS: export
#+EXPORT_EXCLUDE_TAGS: noexport
#+LINK_UP:   
#+LINK_HOME: 

#+startup: beamer
#+LaTeX_CLASS: beamer
#+LaTeX_CLASS_OPTIONS: [bigger]
#+latex_header: \mode<beamer>{\usetheme{Madrid} \usecolortheme{crane}}
#+BEAMER_FRAME_LEVEL: 1
#+BEAMER_HEADER_EXTRA \beamerdefaultoverlayspecification{<+->}

#+COLUMNS: %40ITEM %10BEAMER_env(Env) %9BEAMER_envargs(Env Args) 
%4BEAMER_col(Col) %10BEAMER_extra(Extra)



* The furniture.
Some old some new 

** The Queen's old armchair                                         :B_block:
   :PROPERTIES:
   :BEAMER_env: block
   :BEAMER_envargs: [<+->]
   :END:
# Notice we have to slip into raw LaTeX to make this work
#+begin_LATEX
\begin{itemize}[<+->]
\item Princess Anne 
\item Prince Charles 
\item corgis
\end{itemize}
#+end_LATEX