Henrik, I'm assuming you are aware that Spry is no longer officially supported/ developed by Adobe: http://blogs.adobe.com/dreamweaver/2012/08/update-on-adobe-spry-framework-availability.htm l
Consider switching to jQuery. There are various menu plug-ins you could use. Just google for it
Thanks for your answers SnakEyezo2 and Sudarsahn!
Since the designwiev is there I want to use it, ad obviously I coudn't use it with Sry menus.
So I asked for a soloution that included the use of the designwiev - that I find useful.
I just found out, that the spry menu is no longer supportet by Adobe (thanks Sudarsahn) and therefore I am now using the better "Pop Menu Magic 2" menubar, that allows me to have a verry nice and usable designview. Problem solved.
Thanks again for your support.