NAV 2009 R2 Debugging with VS

Hello,
I have Visual Web Developer 2008 Express installed
And I’m missing the option to attach process :
Do I need another edition or version to make debug possible on 2009 R2 ?
Thanks - Gustav

Hope this helps -
saurav-nav.blogspot.in/…/debugging-in-nav-20092009sp1-nav2009r2.html