Accessing class from another project...

Hi
We are creating a programming language as a semester project, and we now have the lexer finished. I now want to play around with creating a simple IDE for the language, and I need to invoke the lexer which is in a seperate project.
I have add the lexer project to my IDE solution, and added the project as a reference to the IDE project, but i still cant access the classes from the other project. How is this done?

nwm solved it :)