Here is the title error with complete paths:
\\\\psf\\Home\\Dropbox\\Development\\Repositories\\GIT\\i-cc\\Powerhouse\\Notes\\master\\flash\\lib\\libnote\\
If you want to add the other functionality (onAddedToStage() etc), extend the class coming from the swc. Something like:
onAddedToStage()
public class NotesCoreEx extends NotesCore { ... }