[RESOLVED] fl.controls missing?

[ampo_webdesign]

This one simply killed me:

I create a brand new AS flash file. I put only one line of code in the timeline script:

import fl.controls.ComboBox;

And I get an error:

1172: Definition fl.controls:ComboBox could not be found.

There is nothing else in the file, it is AS3. Can it be my mistake by any chance? Am I so tired that I am missing something? Do you get that error too?

I also tried this:

import fl.controls.*;

which gives me the same result.
Is there any explanation for this? Please help.