Integration

I believe that it's a very simple thing that I didn t get. Here is the deal.

Consider a simple process with two activities, the first one is a screenflow with two buttons, a submit one and a cancel one.
Even if I click on Cancel button , the instance keeps going to next activity.

I already try to get the selectedbutton and use action = BACK, CANCEL, etc... without success.

How can I make it works like the X button, whether the instance stays at the same activity?

Tks