Нактунлся тут на такое вот:
Код AS3:
[native(cls="ElementFormatClass",instance="ElementFormatObject",methods="auto")]
[Version("10")]
public final class flash.text.engine.ElementFormat extends Object
{
native public function ElementFormat(fontDescription:flash.text.engine.FontDescription = null,fontSize:Number = 12.0,color:uint = 0,alpha:Number = 1.0,textRotation:String = "auto",dominantBaseline:String = "roman",alignmentBaseline:String = "useDominantBaseline",baselineShift:Number = 0.0,kerning:String = "on",trackingRight:Number = 0.0,trackingLeft:Number = 0.0,locale:String = "en",breakOpportunity:String = "auto",digitCase:String = "default",digitWidth:String = "default",ligatureLevel:String = "common",typographicCase:String = "default"):*;
native public function get alignmentBaseline():String;
native public function set alignmentBaseline(alignmentBaseline:String):void;
native public function get alpha():Number;
native public function set alpha(value:Number):void;
native public function get baselineShift():Number;
native public function set baselineShift(value:Number):void;
native public function get breakOpportunity():String;
native public function set breakOpportunity(opportunityType:String):void;
native public function get color():uint;
native public function set color(value:uint):void;
native public function get dominantBaseline():String;
native public function set dominantBaseline(dominantBaseline:String):void;
native public function get fontDescription():flash.text.engine.FontDescription;
native public function set fontDescription(value:flash.text.engine.FontDescription):void;
native public function get digitCase():String;
native public function set digitCase(digitCaseType:String):void;
native public function get digitWidth():String;
native public function set digitWidth(digitWidthType:String):void;
native public function get ligatureLevel():String;
native public function set ligatureLevel(ligatureLevelType:String):void;
native public function get fontSize():Number;
native public function set fontSize(value:Number):void;
native public function get kerning():String;
native public function set kerning(value:String):void;
native public function get locale():String;
native public function set locale(value:String):void;
native public function get textRotation():String;
native public function set textRotation(value:String):void;
native public function get trackingRight():Number;
native public function set trackingRight(value:Number):void;
native public function get trackingLeft():Number;
native public function set trackingLeft(value:Number):void;
native public function get typographicCase():String;
native public function set typographicCase(typographicCaseType:String):void;
native public function get locked():Boolean;
native public function set locked(value:Boolean):void;
native public function getFontMetrics():flash.text.engine.FontMetrics;
native public function clone():ElementFormat;
}
baselineShift - вроде бы похоже на то что надо...