Hello Pranzo,

It has been a while since you have made your post, in case you still need support I will be glad to assist you further. I suppose the other community members can benefit from this answer as well. I have been looking into your post and I suggest you see this forum thread:

http://forums.infragistics.com/forums/p/48236/302998.aspx

Where a similar issue like yours is discussed.

Feel free to write me if you have further questions.

I solved by following this link.

http://help.infragistics.com/Help/NetAdvantage/WPF/2011.1/CLR4.0/html/InfragisticsWPF4.Reporting.v11.1~Infragistics.Windows.Reporting.XamReportPreview~GeneratePreview.html

now I need more of one thing:
how do I render the sheet horizontally by default?

thanks