Flex 3.5：无法在选项卡导航器中检索 VBOX 的子项

Question

我在 tabNavigator 中有 2 个 VBox。

我感兴趣的 VBox 的代码片段如下所示，

<mx:TabNavigator  id ="tabNav">

<mx:VBox label="Class Details" name="clsDetail" id="ClsDetails" height="301" width="300" >
       <mx:FormItem label="PropID"  name="PropoId" id="propoIDForm" direction="horizontal">
            <mx:NumericStepper id="propagatedIDInput" name ="objId"  minimum="0" maximum="100" stepSize="1" width="65"/>
       </mx:FormItem>

<mx:FormItem label="Difficulty" direction="horizontal">
                    <mx:RadioButtonGroup id="difficulty"/>
                    <mx:RadioButton label="Easy" groupName="difficulty" value="1"/>
                    <mx:RadioButton label="Medium" groupName="difficulty" value="2"/>
                    <mx:RadioButton label="Hard" groupName="difficulty" value="3"/>
          </mx:FormItem>

</mx:VBox>
</mx:TabNavigator>

我正在尝试设置数字步进器运行时，但无法做到这一点。尝试了 2 种方法，

Approach 1: iterate through children and get the one

   var VBoxChildren:Array = ClsDetails.getChildren();
   for each(var currentFormItem:FormItem in VBoxChildren)
    {
     var FormChildren:Array = currentFormItem.getChildren(); //somehow it is becoming null
       for each(var currentItem:* in FormChildren) //doesn't go in since the array is null)
            {
              if(currentItem is NumericStepper)
                {
                 (currentItem as NumericStepper).value = int(markedObject.propagatedID);
                }
            }
      }

Approach 2: try to get children byname

  var myVBox:VBox = tabNav.getChildByName("clsDetail") as VBox;

   var frmItem:FormItem = myVBox.getChildByName("PropoId") as FormItem;//issue it becomes null ..somhownot able to get this children even though it is visible when I debug

    var  objId:NumericStepper = frmItem.getChildByName("objId") as NumericStepper; undefined as above is null

我不确定我在这里缺少什么......建议非常感谢！

Thanks
Akshay

Answer 1

我在 adobe 论坛上发布了我的问题，响应解决了它...实际上，延迟实例化的问题不是在选项卡导航器内设置我的子组件，而只是设置 VBox （第一个子组件）...

我所缺少的只是设置createPolicy = all（正如我上面的评论所解释的）...它的工作方式就像魅力..

这里有一篇关于 PureMVC 的关于 Flex 组件延迟实例化的好读物 http://puremvc.org/content/view/91/188/