Exported PDF orientation

Hello,

I use :

SmartClient Version: v9.1p_2014-03-31/PowerEdition Deployment (built 2014-03-31)

IE 8

I try to export a ListGrid content in pdf format this way (js client code) :

isc.RPCManager.exportContent(grid);

My problem is that this pdf export is made with portrait orientation and my ListGrid is truncated.

How can I set page orientation of exported pdf ?

Thanks in advance