Noob question

Sorry, noob question here, but how do you end a motion tween in flash cs4? Here’s my problem…

I made a motion tween, it comes in and fades in, stays for 30 seconds and loolks good, then i insert a “all” keypoint after the 30 seconds and insert(extend the frames) frame ten frames beyond the keypoint and try to tween, as i did before, but instead of it creating a new tween after the “all” keypoint, it uses a keypoint in the middle of the previous tween (or something)

Any ideas on whats going on?