How to change the execution order inside a FBD / CFC

How to change the execution order inside a FBD / CFC

Hello,

I am currently designing the logic for a valve with zenon logic studio.
I defined the logic within several networks.
Afterwards I clicked the "show execution order"-button in the toolbar. I can see perfectly which block is executed but:

The execution order is not correct for the logic I created and I want to change it. 

How can I change this execution order? Do I have to delete everything and put it in correct order?

Denis