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<mx:PopUpMenuButton id="popupbtn_sendKey" width="20" height="60" labelField="@label" itemClick="popupbtn_sendKey_itemClickHandler(event)"/>
ArgumentError: 状态“popUpOver”未定义。
at mx.core::UIComponent/getState()[E:\dev\gumbo_beta2\frameworks\projects\framework\src\mx\core\UIComponent.as:9424]
at mx.core::UIComponent/findCommonBaseState()[E:\dev\gumbo_beta2\frameworks\projects\framework\src\mx\core\UIComponent.as:9444]
at mx.core::UIComponent/commitCurrentState()[E:\dev\gumbo_beta2\frameworks\projects\framework\src\mx\core\UIComponent.as:9275]
at mx.core::UIComponent/setCurrentState()[E:\dev\gumbo_beta2\frameworks\projects\framework\src\mx\core\UIComponent.as:9220]
at mx.core::UIComponent/set currentState()[E:\dev\gumbo_beta2\frameworks\projects\framework\src\mx\core\UIComponent.as:5740]
at mx.controls::Button/http://www.adobe.com/2006/flex/mx/internal::viewSkinForPhase()[E:\dev\gumbo_beta2\frameworks\projects\framework\src\mx\controls\Button.as:2045]
at mx.controls::PopUpButton/http://www.adobe.com/2006/flex/mx/internal::viewSkin()[E:\dev\gumbo_beta2\frameworks\projects\framework\src\mx\controls\PopUpButton.as:718]
at mx.controls::PopUpButton/rollOverHandler()[E:\dev\gumbo_beta2\frameworks\projects\framework\src\mx\controls\PopUpButton.as:1114]
<?xml version="1.0" encoding="utf-8"?>
<!-- PopUpMenuButton control example. -->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">
<mx:Script>
<![CDATA[
import mx.events.*;
import mx.controls.*;
//Event handler, invoked when you select from the menu.
public function itemClickHandler(event:MenuEvent):void {
Alert.show("Menu label: " + event.label
+ " \n menu item index within parent menu: " + event.index);
}
]]>
</mx:Script>
<!-- A an data provider in E4X format. -->
<mx:XMLList id="treeDP2">
<node label="Inbox"/>
<node label="Calendar"/>
<node label="Deleted Items"/>
</mx:XMLList>
<mx:Panel title="PopUpMenuButton Control Example" height="100%" width="100%"
paddingTop="10" paddingLeft="10" paddingRight="10">
<mx:Label width="100%" color="blue"
text="Click the down arrow to open the menu."/>
<mx:PopUpMenuButton id="p2"
dataProvider="{treeDP2}"
labelField="@label"
itemClick="itemClickHandler(event);"/>
</mx:Panel>
</mx:Application>