Adding a Second Library Panel
Flash CS4 Tutorial
How to Add Another Library Panel in Flash
By default you will see one Library panel in Flash. It may be helpful to display two panels at times. For instance, if you have two documents open, you may wish to open a Library panel for each file.
Open two Flash documents, both with content, at the same time.
By clicking each document's tab, you can toggle between the files.
Open the Library panel (Window > Library or Cmd/L (PC - Ctrl/L).
Click the New Library icon to add a new Library panel.
Using the Library panel pull-down menu, set the second panel to the other document.