Tweening text question

Hi there,
I’ve recently downloaded a sample flash intro movie.
It is full of motion tweens of static textfields…
These textfields are not symbols. The weird thing is
that the library is filled only with a few items…

When I want to motion tween textfields flash automatically
adds a graphic symbol in my library called ‘Tween 1’.

What’s the trick to motion tween the fields without
having my library packed with hundreds of tween graphic
symbols?

Thanks