Баги TextField в iOS

Код AS3:

package
{
	import flash.display.Graphics;
	import flash.display.Sprite;
	import flash.display.StageAlign;
	import flash.display.StageScaleMode;
	import flash.events.FocusEvent;
	import flash.events.MouseEvent;
	import flash.system.Capabilities;
	import flash.text.TextField;
	import flash.text.TextFieldType;
 
	public class TextFieldBug extends Sprite
	{
		private var _textField:TextField;
		private var _dpi:Number = Capabilities.screenDPI;
 
		public function TextFieldBug()
		{
			super();
 
			stage.align = StageAlign.TOP_LEFT;
			stage.scaleMode = StageScaleMode.NO_SCALE;
 
			stage.addEventListener(FocusEvent.MOUSE_FOCUS_CHANGE, stage_mouseFocusChangeHandler);
 
			_textField = new TextField();
			_textField.type = TextFieldType.INPUT;
			_textField.height = realToPixels(0.5);
			_textField.width = realToPixels(2);
 
			addChild(_textField);
 
			var button:Sprite = createButton();
			addChild(button);
 
			button.addEventListener(MouseEvent.CLICK, button_clickHandler);
 
			_textField.requestSoftKeyboard();
		}
 
		private function button_clickHandler(event:MouseEvent):void
		{
			_textField.text += ":(";
		}
 
		//lock focus on TextField
		private function stage_mouseFocusChangeHandler(event:FocusEvent):void
		{
			if (event.relatedObject is TextField)
				return;
 
			event.preventDefault();
		}
 
		private function createButton():Sprite
		{
			var button:Sprite = new Sprite();
			var g:Graphics = button.graphics;
 
			g.beginFill(0xFF0000);
			g.drawRect(0, 0, realToPixels(1), realToPixels(1));
			g.endFill();
 
			return button;
		}
 
		private function realToPixels(inch:Number):Number
		{
			return inch * _dpi;
		}
	}
}