I am testing FB4 with an AS-only project (no flex SDK). The goal is to create assets in an FLA using Flash CS4, export them as a SWC and have the SWC Library Symbols show in the FB Package Explorer by adding the SWC to the project library path. This works great, however there seems to be a bug where the SWCs are not updating in some cases.
Create an AS project in FB.
Create an FLA and have it publish to "assets.swc".
Add the SWC into the FB project's library path.
Add a library symbol in the FLA with linkage class "assets.MySymbol".
Add a movieclip in the new symbol called "myMC"
Publish FLA to SWC.
Browse the FB Package Explorer -> Referenced Libraries -> assets.swc
Verify that the 'assets ->MySymbol.abc -> MySymbol -> myMC' item shows up
In CS4, change the name of the movielcip to "myMC2"
Recompile FB project
Do a right-click refresh on FB project
New MC name is not reflected in package explorer.