The Nodes As Tabs addon allows for this:
http://xenforo.com/community/resources/nodes-as-tabs.9/
Page nodes actually use HTML, not BB code. For example, this is a HTML image tag:
Code:
<img src="http://www.domain.com/image.gif" />
Or if you want to use BB code then you can actually assign a thread to a tab using the Nodes As Tabs addon. An example is in the addon description:
Threads allow BB code formatting.