Ah Now I know what you are doing! The two injects in the upper left corner injects data to the function "My LED".
The lower flow starts with a Lynx-in node that is connected to MyLED and every time somethings happens on this function it is printed in the debug pane.
I have simply pressed the inject nodes 1 and 0 alternately and as you can see the value in the debug pane is 1 and 0.