Open OmniGraffle and Print Document

I am new to Applescript and OmniGraffle. Can someone point me in the right direction. I would like to write a script that opens a document in OmniGraffle and prints it. Thats it, but I have no idea how to start. Thanks for your help.

Tell Application "OmniGraffle"
print alias "Path to your:File:Goes:here.graffle"
end

Note:
Print command will open and print the document and close it again. Be sure to replace the path to the file to correspond with the document you want printed.

Good luck!

Thank you very much!