I have the Arduino "HelloWorld" LCD project, compiled, built and running nicely on AvrStudio 4, haven't tried any debugging yet, but should be ok. Anything in particular you are having problems with. Send me a PM and i can send you the project. Most of the challenge is getting the command settings correct, and the include paths right, as well you need to import the libcore.a library that Arduino creates on a compile.
This can get you started.http://www.avrfreaks.net/index.php?name=PNphpBB2&file=viewtopic&t=59453
as well http://arduino.cc/forum/index.php/topic,62094.0.html