You can use behaviors to associate media controller with media display
place the media controller instance and media dispaly instance on the
stage and give them names e.g. media controller -> myController
and media display -> myDisplay
and perform the following steps:
1) With the media controller instance selected, open the Behaviors panel (Window > Behaviors).
2) In the Behaviors panel, click the Add (+) button, and select Media > Associate Display.
3) In the Associate Display window, select myDisplay under _root, and click OK.