In flex, how to make a component appear on the center of screen?

In Flex, how to put some component ( like canvas ) appear at the center of the screen. ( even if there is scroll, it 开发者_StackOverflowshould be displayed at the center of the current view).

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The PopUpManager's centerPopUp will do this easy, if that is what you're after.

But, if you want to display something in the center of a container that is a bit different. In that sitaution, you'll probably either have to write your own positioning code (in updateDisplayList() ) to center the component and position the others.