Separating video tracks

Hello Guys:
I have shot and successfully edited many 2 cameras shoots on FCPX 10.0.6 without any problems. I have just shot a concert and for the first time I've used three cameras. I've imported all the footage and moved all three to the timeline and they're synced up and ready to go. I wanted to open on camera 3 but when I try to roll (or ripple) cameras 2 or 1 they move in the timeline the same as camera 3 and they are "greyed out" up to that point and I haven't been able to solve the problem. Like I said this is the first time I've shot with three cameras and tried to edit the footage from them. Hopefully you guys can offer some suggestions. I've attached a screen shot, hope it helps.

Thanks

Chuck