UI Loader issue

programming flash
1

on Roll_over I am increasing uiLoader width and Height for Zoomed version

so when I roll Over first loader , it appears behind 2nd loader ,
similarly when I rollover 2nd loader , it appears behind 3rd loader

for(var k:int=0; k<5; k++)
	{
		var uiLoader:UILoader = new UILoader();
		
		uiLoader.x = k*80 + 85;
		
		uiLoader.source = myPro.Item[k].ItemImage;
		addChild(uiLoader);
		uiLoader.addEventListener(MouseEvent.ROLL_OVER, expand);
	uiLoader.addEventListener(MouseEvent.ROLL_OUT, contract);
	}