Noob OOP class question

I’m switching to full OOP programming since I have nothing else to do other than to learn the same language again. Anyway I’ve got a question about accessing public vars in a subclass:

Test.as


package
{
	import flash.display.Sprite;
	import SubTest;
	public class Test extends Sprite
	{
		public var _sW:uint;
		public var subTest:SubTest;
		public function Test() 
		{
			subTest = new SubTest();
			trace("This is the Test class", sW); // returns stageWidth normally;
		}
		public function get sW():uint {
			_sW = stage.stageWidth;
			return _sW;
		}
	}

}

SubTest.as


package
{
	public class SubTest
	{
		public function SubTest()
		{
			trace("This is the SubTest class", sW); // I get an unknown variable sW;
		}
		
	}

}

Why can’t I call the get sW method from the Test.class since it is public method and resides within the same package?