Is Ajax features invalid if set an "ajax page" as an "iframe page" of another main page??

HI Guys:

I upgraded my atlas web application to the ajax v1.0 version and found a series problem: the ajax feature ( "no postback" ) is invalid in an "iframed page"!!

For exsample: I develop an ajax page A--- yes, it has scriptManager , updatepanel, some buttons in it and so on……, if I open the page in a unique IE brower, everyting works fine , i can savor the amoratic breeze of ajax effects; however , If I open page B where these codes place:

<iframe src=http://page A url width="700px" height="700px" scrolling="no" frameborder="0" ></iframe>

, or I can say if I experience page A in another parent page B -- the exited ajax effects disappeared!!! Moreover I get some "access denied" alert.

Who can tell me why? when i used the ajax RC version, I dident meets this . But now the final version baffles me and aggravate my aspiration of continious development.

Up Need help!