The Create Email Message wizard is supposed to appear. If you take a look at the feature tour, it shows what the interface should look like. The feature tour can be found here:
When you click on the access point, does it seem like Dreamweaver is working or does it just immediately go into an idle state again right away?
Another way to access the behavior is to open the server behaviors panel. Click the plus button on that and under WebAssist there should be a Create Email Message option there as well. Give that access point a try as well.