Loading Library Item within a package

Hey Yall, I need help.
Can anyone help with getting a external class package to load and custom library item?

package {
import flash.display.MovieClip;

public class Ball extends MovieClip {
	public var radius:Number;
	private var color:uint;
	public var vx:Number = 0;
	public var vy:Number = 0;
	public var mass:Number = 1;
	public function Ball(radius:Number=40, color:uint=0x000000) {
		this.radius = radius;
		this.color = color;
		this.alpha = .5;
	public function init():void {
		ball:Ball = new Ball();


The class name of the library item is Ball.
Base class is flash.display.MovieClip