如何使用Actionscript指定Flex“适合内容”

Flex Builder defaults some components to "fit to content" if you don't specify a set width or height. I'm trying to fill a mx:Tile component with Actionscript, but the layout has some strange spacing when I don't specify the width of a component I add to it. Is there a way to set the components to "fit to content" using Actionscript?Flex Builder defaults some components to "fit t