How to? RE: New Tweens

Just having a problem with one aspect of the new tween model is CS4.

When you create a tween, and for example change the alpha property this creates a diamond on the timeline, what would have been a keyframe with a classic tween.

Can these by moved? i.e. if I have one on frame 20 can I move it to frame 30 without undoing the property and reapplying it, in other words can these be dragged like a keyframe.

I have tried and tried and I just can’t achieve this, if this isn’t possible it seems strange. I hope I’m wrong and it can be done.

Does anyone know how?