Breve code will work regarding mouse click

Hi There,

In breve I saw that mouse click will work on the specific item. But I want to design a simulator where I can click my mouse in any position on the simulator window when my simulation is running(Please remember not on the specific item always). When I will click any position of the simulator window,then the simulator will take the mouse position and can call any arbitrary method( Later this method can use that mouse position).
Is there anybody know, which method or Breve function is responsible for this case or how to handle it? If know inform me please.

Thanks,
Jahangir Kabir.