if(textCaption != null){

removeChild(textCaption);

}//remove if it exists

textCaption = new TextField();

var font:Verdana = new Verdana(); //linkage name in library

var format:TextFormat = new TextFormat(); //should have separate formatting function

format.font = font.fontName;

format.color = textColorVar;

format.size = infoFontSize;

format.align = TextFormatAlign.LEFT;

textCaption.x = thumbnailWidth + textBorder; 

textCaption.y = imageHeight + headingHeight;

textCaption.width = stage.stageWidth – thumbnailWidth;

textCaption.height =  200; //don’t need height if autosize single or multiline text

textCaption.multiline = true;

textCaption.wordWrap = true;//must be set else cuts off

//textCaption.autoSize = TextFieldAutoSize.LEFT;

textCaption.antiAliasType = flash.text.AntiAliasType.ADVANCED;

textCaption.selectable = false;

textCaption.embedFonts = true;

addChild(textCaption);

textCaption.defaultTextFormat = format;

textCaption.text = imageCaptionArray[tempCounter];

}//addTextCaption

NOTES:

To autosize height do not specify a height but must include autosize:

textCaption.wordWrap = true;

textCaption.autoSize = TextFieldAutoSize.LEFT;

textCaption.x =  textBoxXPos; 

textCaption.y = textBoxYPos;

textCaption.width = stageWide – textBoxXPos;

//textCaption.height =  stageHigh – textBoxYPos;//not allowed with autoSize
For width autosize leave out width obviously.