Hey there do you get an error (if so what is it), or is it just a drawing problem? Any more information on the problem will allow us to help you.
The only thing I can see is you didn't add systemInclude.h to your main in the header. #include "systemfunctions.h" so you can have access to function DrawCircle()
EDIT:I don't know why you PM'd to help you with this when I have already posted a reply here