why my WPF-generated XPS file is printed blank?

See more:

WPF

printing

XPS

So, I have a WPF-control, and I have printed it into xps-file.
I can see this file with XPS Viewer - and it is correct.
Moreover, I can print it with XPS Viewer - and have got correct hard copy.
But if trying to do this from my C# code - I can get only blank page.
More details - all works good with simple xps file, but doesn't work with my application-generated file.

Here is code to print:

var server = new PrintServer(serverName);

var queue = new PrintQueue(server, printerName);
{
    var size = new PageMediaSize(PageMediaSizeName.ISOA4);
    queue.UserPrintTicket.PageMediaSize = size;
    var job = queue.AddJob("jobname", file, false);
    {
    }
}

Here is my xps-file
https://drive.google.com/file/d/0BxMl8yVSfSsSd0RkeUlraHJ6S3c/view?usp=sharing[^]

Thank you!