Sagging Roof
 

I own a beautiful RR '98 4.6 HSE with a sagging interior roof. The fabric started sagging in the rear and has now reached the middle of the truck, how do i fix this problem before my entire interior is drapping over my head? I dont want to staple it up, as that will look horrible, but the side panels that hold it in place dont have any screw holes. How can i stretch & glue it back in place with out tearing-up my side panels?