About using Timelines with screens (Flash Professional only)

Each screen has its own Timeline. The Timeline is collapsed by default. You must expand it to work with frames or layers.

You cannot view or modify the main Timeline of a screen-based document.

You can add frames, keyframes, and layers, and manipulate content on a screen's Timeline. For information on working with the Timeline, see Using the Timeline.

In the Timeline, nested screens work much as nested movie clips do, with some exceptions. See How screens interact with ActionScript (Flash Professional only).