I made a nice 3d animation for a small film company. Now I need to add some 3d lettering that bounces into the animation. CTA 3 is perfect for this, making it a piece of cake, except I need the animation in the background to stop when it reaches the end, and stay there. It doesn't matter whether I put the 3d video in the background or rotoscope it somehow on a prop, as long as it stops. I can not find a way, however, to get the animation to stop looping. How could I do this? 
I'd appreciate it if anybody can knows how to stop the looping in the imported video background.