[Orgmode] Beamer center frametitle and block?

[Bruno Tavernier]

I search on Worg and in the info file but could not find if there is
an option to select the position (left,center,right) of beamer's
frametitle and block?

Currently org exports to latex like that:
,----
| \begin{block}{myblocktitle}
`----
and apparently [1] what I need is:
,----
| \begin{block}{\begin{center}myblocktitle\end{center}}
`----

Any hint appreciated,

-- 
Bruno


Footnotes:

[1] after rambling on the web