Error 1172 tries to use the class mx.controls.List

I'm writing code Action script in Flex Builder 3 but I'm unable to use some of the classes in the mx package. When I import like this:

Import mx.managers.PopUpManager;
Import mx.controls.List;
to import flash.display.SimpleButton;

SimpleButton imports fine but for PopUpManager and list control, I got these errors:

1172: definition mx.managers:PopUpManager could not be found.
1172: definition mx.controls:List could not be found.

Other controls in the mx package seem to be available as mx.managers.IFocusManager (as well as three other mx.managers interfaces.

Why the part of the mx package is available?

Problem solved now. It turned out that I could not access the complete packages because my project was an ActionScript project instead of a Flex project.

Tags: Flex

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