Consider I have a DoubleProperty:

DoubleProperty property;

Then I want to add a listener that outputs its value. So I type:

property.addListener(o -> sout[tab]);

and press tab key where indicated.

Two results possible:
- By default I get nothing as I'm still inside the red border box (specifying parameters).
- If I has cancelled it, I'll get 

property.addListener(o -> System.out.println(""););

which is syntactically incorrect.

Expected result is as following, preferrably even when entered while inside the red box:

property.addListener(o -> System.out.println(""));