How I can choose the orientation pages in PDFCreator?

 Hi,

we have developing an application that can export to pdf the documents and some times when I choose in the printer options the orientation, PDFCreator don't print with the right orientation. I am changing PDFCreator options changing the registry values. How I can specify the orientation in PDFCreator? I have tried to change the value of autorate flag but I have checked that this can't help me.

Can any help me please?

Thanks.