Foam pad on window in RV door: monofilament holds it in

I had to use something to hold the insulating cushions in the roof vents. I found some stretchy flat cord in walmart sewing section. It's 1/2 wide and came in a roll, I loosened the trim screws and stuck it behind the trim piece on each side so it straddles the opening. Being stretchy it's real easy to take the cushions in and out. It might not work well with something thin but great for the cushions.