Apple Motion 3 - Manual (Page 375)

Chapter 5 Using Behaviors 375
Where Behaviors Appear
When you apply a behavior to an object, it appears nested underneath that object in
the Layers tab and the Timeline.
New behaviors you apply to an object appear above other behaviors that were applied
previously.
Nested behaviors as they appear in the Layers tab
Nested behaviors as they appear in the Timeline
Newly applied behaviors appear
above those that have been
previously applied. Behaviors
appear with all of their editable
parameters in the Behaviors tab
of the Inspector.