Iframes & Expanding Content Widget

Hi,

I have a need to embed content from other sites in iframes on some pages, but when I do so, I cant get the content pane (containing the iframe) to expand to fit the document retrieved via the iframe and push any layout templates down on the page. What am I missing here? In the screenshot attached you'll see the content block and the document flowing out of it.

Is there a best practice to accomplish this functionality?