Export to PDF - DS1.5

Hi Experts,

I am using Design Studio 1.5 SP2 and referring the Export to PDF functionality using .exportApplicationScreen(). In the popup screen where we see the orientation, Is there a way to display the 'Portrait' mode only and hide/restrict the 'Landscape' mode(pls see the file attached) ?  I have already searched in SCN but could not find out if it is really possibe at all.

Thanks & Regards,

Kesavan.