Vaadin XS under "dojo web page"

Hi
We have tried to test the XS plugin.
We based our test on this blog post.
It works fine as a stand alone web application.
When we try to embedded it inside our target platform (VMWare VCO web UI which is based on dojo ) we can not see the Vaadin iframe in the page.
It looks like the JSONP trick is broken somehow and cross site scripting is not enabled any more ...:mad:
See attachments for details.
Thanks
Avishay