The StageAlign class offers constant values that can be used for the Stage.align property.
The StageScaleMode class provides values for the Stage.scaleMode property.
http://help.adobe.com/nl_NL/AS3LCR/Flash_10.0/flash/display/StageAlign.html
http://livedocs.adobe.com/flash/9.0/ActionScriptLangRefV3/flash/display/StageAlign.html
Example:
package nl.hardcode { import flash.display.MovieClip; import flash.display.StageAlign; import flash.display.StageScaleMode; public class Whatever extends MovieClip { public function Whatever () { stage.align = StageAlign.TOP_LEFT; stage.scaleMode = StageScaleMode.NO_SCALE; } } }