Include Files Not Showing In Design View - WHY?

I have 2 include files on my page which are both navigation bars. When i view my pages in IE they look fine and everything is in the correct place, however the problem is that when i look at the pages in design view in Dreamweaver i can only see my first include file. the rest of the page is not displayed so makes designing hard as i cant really see what i am doing until i view my page in IE.

WHY IS IT DOING THIS???????????????? Or is this meant to happen, i have never used include files before, but im assuming this shouldnt happen?

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