If the content of component Dialog is an <iframe> element then the behaviour of the page is not correct:
- if the src of the <iframe> points to an unprotected asset then the entire page (starting from the dialog) will be undisplayed and no dojo-based components on the page will work
- if the src of the <iframe> is an external site then the dialog is displayed properly only in FF. In IE the dialog can be shown only if the entire content of the <iframe>is loaded.
Probably I should forget iframes at last I will use <div> instead of <iframe> but maybe you'd like to know about this error...