[ShockWave1024]

В любом месте тестового проекта
(например евент initialize)

var tf:TextField = new TextField();
tf.text = "Hello Hello";

var format1:TextFormat = new TextFormat();
format1.color = 0xFF0000;

var format2:TextFormat = new TextFormat();
format2.font = "Courier";

tf.setTextFormat(format1);
var startRange:uint = 6;
tf.setTextFormat(format2, startRange);

addChild(tf);

выскакивает ошибка

Main Thread (Suspended: TypeError: Error #1034: Type Coercion failed: cannot convert flash.text::TextField@2b4d6a9 to mx.core.IUIComponent.)
	mx.core::Container/http://www.adobe.com/2006/flex/mx/internal::addingChild
	mx.core::Container/addChildAt
	mx.core::Container/addChild
	text_test_00/text_test_00::init
	text_test_00/___Application1_initialize
	flash.events::EventDispatcher/flash.events:EventDispatcher::dispatchEventFunction [no source]
	flash.events::EventDispatcher/dispatchEvent [no source]
	mx.core::UIComponent/dispatchEvent
	mx.core::UIComponent/set processedDescriptors
	mx.core::Container/createComponentsFromDescriptors
	mx.core::Container/mx.core:Container::createChildren
	mx.core::UIComponent/initialize
	mx.core::Container/initialize
	mx.core::Application/initialize
	text_test_00/initialize
	mx.managers::SystemManager/http://www.adobe.com/2006/flex/mx/internal::childAdded
	mx.managers::SystemManager/mx.managers:SystemManager::initializeTopLevelWindow
	mx.managers::SystemManager/mx.managers:SystemManager::docFrameHandler

причем примеров таких в хелпе масса
куда бежать? что делать?

весь код теста

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
   initialize="init()">
  <mx:Script>
    <![CDATA[
      import mx.controls.Text;
      
      private function init():void {
        
        var tf:TextField = new TextField();
        tf.text = "Hello Hello";
      
        var format1:TextFormat = new TextFormat();
        format1.color = 0xFF0000;
      
        var format2:TextFormat = new TextFormat();
        format2.font = "Courier";
      
        tf.setTextFormat(format1);
        var startRange:uint = 6;
        tf.setTextFormat(format2, startRange);

        addChild(tf);
      }
    ]]>
  </mx:Script>
</mx:Application>