TSimplegraph Graphlink breakpoint

[DBOUISSON]

Hi

I'm a new user of SimpleGraph and congratulations to the developpers.
I try to build a flowchart (by code) in my application. I created 2 RectangularNode and a Graphlink and add a breakpoint to it.
I works perfectly.
But now, I'd like to move the breakpoint to customize my link but I don't know how to make it.
I think that it's very simple but I didn't find the right way.

Thanks for your help.
Best regards