How do I make a G4P Window frameless, borderless, undecorated?

Hi,

I have the main processing window on screen 1 with an admin interface and a 2nd window via G4P offset in x to appear on the 2nd screen.

window = GWindow.getWindow(this, "Presentation", 1366, 0, 1920, 1080, JAVA2D);

I've been searching quite a bit but I can not figure out how to make the G4P borderless/frameless/undecorated. I'd be really grateful for any pointers.

Thank you, Fabian