as3 MainTimeLine.as class & import fl.video.FLVPlayback

hello one and all,

i am creating a package, MainTimeLine.as, to extend my main timeline.  i use the FLVPlayback component under the package.  however, i get the compile error:

1172: Definition fl.video:FLVPlayback could not be found.

so i added the "import fl.video.FLVPlayback;" line to my MainTimeLine.as file, but flash gives the above error.  now i had this problem when i added this code directly under a frame of the main timeline until i added a FLVPlayback instance to my library.  now, i am trying to simply embed all of the code under the MainTimeLine.as file and have the as file encapsulate all of it.  but, i still get that error.

so, how do i get flash cs4 to recognize and use the import properly?  thank you in advance.