To make our button more interesting, we're going to add a small animation to the Over state and add a slight offset to the Down state.
With the Selection tool, double-click the button instance to edit it.
Press to preview the animation.
Click btn_gallery in the Edit bar to exit symbol-editing mode for the movie clip.
We're done editing the button, so exit symbol-editing mode.
The Enable Simple Buttons feature won't show us the animated Over state, so we'll have to preview our buttons in the Flash Player. Choose Control > Test Movie, or press (Windows) or (Mac).