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Once the pieces of the view are created, event listeners are set up so the view knows what's happening to the strand, especially the size and the value. Changes to the size cause the view to layout out its children. Changes to the value position the thumb over the track.

Be sure to add any sub-components to the strand's display list shortly after creating them. This will fire off those sub-components' life cycles and allow them to trigger their own compositions. This way, when it comes time for your view bead to size and position the sub-elements, they will have dimension. 

RangeModel (model bead)

If you open the RangeModel.as (or any of the other model files) you'll see they are a collection of property setters and getters (and their backing variables, of course). Every property has an event dispatched when it changes. Note that the event is dispatched from the model, not its strand. Beads that need to listen for changes to the model should fetch the strand's model and set up listeners for those properties it is interested in. For example, the Slider's mouse controller bead can update the model value which will be picked up the Slider's view bead and the thumb will change position.

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