Business process management generic ui

Still i am experimenting a cuba platform and I got a example in git-hub bpm sample this code business process management. I have screen related some doubt’s.
this image for a BPM sample UI screen.they created Three screen (1.contract entity,2.Task Entity,3.StartApprovalForm).They developing a process model in that have a start event is havea’n start form scroll down it’s getting a 1.standard form,2.startapprovalform.How thet will getting i will attched that two images.bpm-sample1bpm%20sample2.

I am trying to that startapprovalForm is creating a separate screen will be showing.