[jopendocument] In Table , to place value in cell as CENTRE alignment

[Loïs]

Hello

I'm trying to place value in cell as centre alignment. I don't use
template and i create my spreadsheet like : 
http://www.jopendocument.org/start_spreadsheet_1.html.
I can change the color of the cell like :

final MutableCell<SpreadSheet> cellule = feuille.getCellAt(col, i);
cellule.setBackgroundColor(fondEntete);

but i dont find how to change the alignment of the cell...

Thanks in Advance