Make your animation inside of a movie clip. Go to main timeline. Put an instance of the ProgressBar on stage. Click to highlight. In your Parameters panel, change mode to Manual. Enter ProgressBar. Place your animation on frame 1 of the top most layer.
Delete out the other layers in the ProgressBar. In the Library, in the Component Assets folder, delete the ProgressBarSkin folder.
You could just put the animation on the ProgressBar's timeline too.