ASP.NET page in iFrame problem

Hello,

I've developped a little .NET 3.5 app (using Devexpress controls and
Ms-Ajax) in a wizzard like style.
This page is loaded within a html-page within a iFrame.







my website header



id="blockrandom"
src="http://localhost//Default.aspx?Code="
width="100%"
height="700"
scrolling="auto"
align="top"
frameborder="0"
class="wrapper" />




my website footer





This all works fine, but after clicking on a control initiating an update of
the page, all my styling is gone. so the comboboxes, calender, textboxes,
buttons all look weird, all grey just like the background...
I have compared the 'view source' of the page before and after but they're
the same. I've also created a Word-doc with an example of the DevExpress
Calendar / combobox (http://www.xs4all.nl/~jdgroot/BeforeAndAfter.doc).

TIA:
Jurjen de Groot