Please help: error importing flash.text.TextFormat in CS3

I get the error “The class or interface ‘flash.text.TextFormat’ could not be loaded” everytime I try to import it. same problem with other types. seems they’re just not there. I’m on a mac, if that’s relevant…

The only thing that is listed under display is BitmapData

The only thing that is listed under text is TextRenderer

Haven’t found anything on this on the web. please help

-thomas