Algostudio accessing class from within other class?

Hi,

sorry if this might be a bit of a newbie question but I would like to get my head around the possiblities that ptmc offers.

I am having trouble with using the class from within another class. Here is the example code. It compiles ok but after running it I am getting a "NullReferenceException".

Maybe someone with a little more experience could point me in the right direction?

Thanks!

Here is the example code: http://pastebin.com/ZLpiuM7X