 			_verticalScrollBar.incrementalScrollDelta = _verticalScrollIncrement;
 			_verticalScrollBar.name = "vscrollbar_"+this.name;
 			_verticalScrollBar.width = 15;
-			_verticalScrollBar.addEventListener(MouseEvent.MOUSE_DOWN, function(event:MouseEvent):void{
-				mouseOverDisabled = true;
-			})
+			_verticalScrollBar.addEventListener(Event.ADDED_TO_STAGE, function():void{
+				_verticalScrollBar.addEventListener(MouseEvent.MOUSE_DOWN, function(event:MouseEvent):void{
+					mouseOverDisabled = true;
+				})
+				_verticalScrollBar.stage.addEventListener(MouseEvent.MOUSE_UP, function(event:MouseEvent):void{
+					mouseOverDisabled = false;
+				})
+			});
 			_verticalScrollBar.addEventListener(PyroEvent.SIZE_VALIDATED, onVerticalScrollBarSizeValidated);
 			_verticalScrollBar.addEventListener(PyroEvent.UPDATE_COMPLETE, onVScrollBarUpdateComplete);
-			_verticalScrollBar.addEventListener(MouseEvent.MOUSE_UP, function(event:MouseEvent):void{
-				mouseOverDisabled = false;
-			})
-			
 			_verticalScrollBar.skin = IScrollableContainerSkin(_skin).verticalScrollBarSkin;
 			_verticalScrollBar.addEventListener(ScrollEvent.SCROLL, onVerticalScroll)
 			_verticalScrollBar.doOnAdded()

			_horizontalScrollBar.incrementalScrollDelta = _horizontalScrollIncrement
			_horizontalScrollBar.name = "hscrollbar_"+this.name;
			_horizontalScrollBar.height = 15;
			_horizontalScrollBar.addEventListener(MouseEvent.MOUSE_DOWN, function(event:MouseEvent):void{
				mouseOverDisabled = true;
			})
			_horizontalScrollBar.addEventListener(MouseEvent.MOUSE_UP, function(event:MouseEvent):void{
				mouseOverDisabled = false;
			})
			_horizontalScrollBar.addEventListener(PyroEvent.SIZE_VALIDATED, onHorizontalScrollBarSizeValidated)
			_horizontalScrollBar.addEventListener(ScrollEvent.SCROLL, onHorizontalScroll);
			_horizontalScrollBar.parentContainer = this;

	import org.openPyro.layout.AbsoluteLayout;
	import org.openPyro.layout.IContainerMeasurementHelper;
	import org.openPyro.layout.ILayout;

	/**
	 * UIContainers extend UIControls and introduce
