title: using flex components in pure actionscript without any mxml
body: <p>my Main.as extends flash.display.Sprite, I want to use a ComboBox component in the as, without any mxml, how to implement it? <br>I read this <a href="https://stackoverflow.com/questions/141288/possible-to-use-flex-framework-components-without-using-mxml">Possible to use Flex Framework/Components without using MXML?</a>, its main as extends spark.components.Application, but still need a mxml file. Its main idea is to rewrite the Application component, and reuse it in mxml file. That is not what I want.<br> I uses Flex SDK 4.1</p>