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itemDoubleClick  
   ：
 </p>   ：<br/> <br/> 
 <div style="border-right: #cccccc 1px solid; padding-right: 5px; border-top: #cccccc 1px solid; padding-left: 4px; font-size: 13px; padding-bottom: 4px; border-left: #cccccc 1px solid; width: 98%; word-break: break-all; padding-top: 4px; border-bottom: #cccccc 1px solid; background-color: #eeeeee">
  <span style="color: #0000ff">&lt;?</span>
  <span style="color: #ff00ff">xml version="1.0" encoding="utf-8"</span>
  <span style="color: #0000ff">?&gt;</span>
  <span style="color: #000000"><br/> </span>
  <span style="color: #008000">&lt;!--</span>
  <span style="color: #008000"> http://blog.flexexamples.com/2007/11/29/using-the-itemdoubleclick-event-to-open-nodes-in-a-flex-tree-control/ </span>
  <span style="color: #008000">--&gt;</span>
  <span style="color: #000000"><br/> </span>
  <span style="color: #0000ff">&lt;</span>
  <span style="color: #800000">mx:Application </span>
  <span style="color: #ff0000">xmlns:mx</span>
  <span style="color: #0000ff">="http://www.adobe.com/2006/mxml"</span>
  <span style="color: #ff0000"><br/>         layout</span>
  <span style="color: #0000ff">="horizontal"</span>
  <span style="color: #ff0000"><br/>         verticalAlign</span>
  <span style="color: #0000ff">="middle"</span>
  <span style="color: #ff0000"><br/>         backgroundColor</span>
  <span style="color: #0000ff">="white"</span>
  <span style="color: #ff0000"><br/>         creationComplete</span>
  <span style="color: #0000ff">="init();"</span>
  <span style="color: #0000ff">&gt;</span>
  <span style="color: #000000"><br/> <br/>     </span>
  <span style="color: #0000ff">&lt;</span>
  <span style="color: #800000">mx:Script</span>
  <span style="color: #0000ff">&gt;</span>
  <span style="color: #000000"><br/>         </span>
  <span style="color: #0000ff">&lt;![CDATA[</span>
  <span style="color: #808080"><br/>             import mx.events.ListEvent;<br/> <br/>             private function tree_itemDoubleClick(evt:ListEvent):void {<br/>                 var node:XML = tree.selectedItem as XML;<br/>                 var isOpen:Boolean = tree.isItemOpen(node);<br/>                 tree.expandItem(node, !isOpen);<br/>             }<br/>         </span>
  <span style="color: #0000ff">]]&gt;</span>
  <span style="color: #000000"><br/>     </span>
  <span style="color: #0000ff">&lt;/</span>
  <span style="color: #800000">mx:Script</span>
  <span style="color: #0000ff">&gt;</span>
  <span style="color: #000000"><br/> <br/>     </span>
  <span style="color: #0000ff">&lt;</span>
  <span style="color: #800000">mx:XMLListCollection </span>
  <span style="color: #ff0000">id</span>
  <span style="color: #0000ff">="xmlListColl"</span>
  <span style="color: #0000ff">&gt;</span>
  <span style="color: #000000"><br/>         </span>
  <span style="color: #0000ff">&lt;</span>
  <span style="color: #800000">mx:source</span>
  <span style="color: #0000ff">&gt;</span>
  <span style="color: #000000"><br/>             </span>
  <span style="color: #0000ff">&lt;</span>
  <span style="color: #800000">mx:XMLList</span>
  <span style="color: #0000ff">&gt;</span>
  <span style="color: #000000"><br/>                 </span>
  <span style="color: #0000ff">&lt;</span>
  <span style="color: #800000">node </span>
  <span style="color: #ff0000">label</span>
  <span style="color: #0000ff">="One"</span>
  <span style="color: #0000ff">&gt;</span>
  <span style="color: #000000"><br/>                     </span>
  <span style="color: #0000ff">&lt;</span>
  <span style="color: #800000">node </span>
  <span style="color: #ff0000">label</span>
  <span style="color: #0000ff">="One.1"</span>
  <span style="color: #0000ff">&gt;</span>
  <span style="color: #000000"><br/>                         </span>
  <span style="color: #0000ff">&lt;</span>
  <span style="color: #800000">node </span>
  <span style="color: #ff0000">label</span>
  <span style="color: #0000ff">="One.1.1"</span>
  <span style="color: #0000ff">&gt;</span>
  <span style="color: #000000"><br/>                             </span>
  <span style="color: #0000ff">&lt;</span>
  <span style="color: #800000">node </span>
  <span style="color: #ff0000">label</span>
  <span style="color: #0000ff">="One.1.1.1"</span>
  <span style="color: #0000ff">&gt;</span>
  <span style="color: #000000"><br/>                                 </span>
  <span style="color: #0000ff">&lt;</span>
  <span style="color: #800000">node </span>
  <span style="color: #ff0000">label</span>
  <span style="color: #0000ff">="One.1.1.1.1"</span>
  <span style="color: #ff0000"> </span>
  <span style="color: #0000ff">/&gt;</span>
  <span style="color: #000000"><br/>                             </span>
  <span style="color: #0000ff">&lt;/</span>
  <span style="color: #800000">node</span>
  <span style="color: #0000ff">&gt;</span>
  <span style="color: #000000"><br/>                         </span>
  <span style="color: #0000ff">&lt;/</span>
  <span style="color: #800000">node</span>
  <span style="color: #0000ff">&gt;</span>
  <span style="color: #000000"><br/>                     </span>
  <span style="color: #0000ff">&lt;/</span>
  <span style="color: #800000">node</span>
  <span style="color: #0000ff">&gt;</span>
  <span style="color: #000000"><br/>                     </span>
  <span style="color: #0000ff">&lt;</span>
  <span style="color: #800000">node </span>
  <span style="color: #ff0000">label</span>
  <span style="color: #0000ff">="One.2"</span>
  <span style="color: #ff0000"> </span>
  <span style="color: #0000ff">/&gt;</span>
  <span style="color: #000000"><br/>                     </span>
  <span style="color: #0000ff">&lt;</span>
  <span style="color: #800000">node </span>
  <span style="color: #ff0000">label</span>
  <span style="color: #0000ff">="One.3"</span>
  <span style="color: #ff0000"> </span>
  <span style="color: #0000ff">/&gt;</span>
  <span style="color: #000000"><br/>                 </span>
  <span style="color: #0000ff">&lt;/</span>
  <span style="color: #800000">node</span>
  <span style="color: #0000ff">&gt;</span>
  <span style="color: #000000"><br/>                 </span>
  <span style="color: #0000ff">&lt;</span>
  <span style="color: #800000">node </span>
  <span style="color: #ff0000">label</span>
  <span style="color: #0000ff">="Two"</span>
  <span style="color: #0000ff">&gt;</span>
  <span style="color: #000000"><br/>                     </span>
  <span style="color: #0000ff">&lt;</span>
  <span style="color: #800000">node </span>
  <span style="color: #ff0000">label</span>
  <span style="color: #0000ff">="Two.1"</span>
  <span style="color: #ff0000"> </span>
  <span style="color: #0000ff">/&gt;</span>
  <span style="color: #000000"><br/>                     </span>
  <span style="color: #0000ff">&lt;</span>
  <span style="color: #800000">node </span>
  <span style="color: #ff0000">label</span>
  <span style="color: #0000ff">="Two.2"</span>
  <span style="color: #ff0000"> </span>
  <span style="color: #0000ff">/&gt;</span>
  <span style="color: #000000"><br/>                     </span>
  <span style="color: #0000ff">&lt;</span>
  <span style="color: #800000">node </span>
  <span style="color: #ff0000">label</span>
  <span style="color: #0000ff">="Two.3"</span>
  <span style="color: #ff0000"> </span>
  <span style="color: #0000ff">/&gt;</span>
  <span style="color: #000000"><br/>                 </span>
  <span style="color: #0000ff">&lt;/</span>
  <span style="color: #800000">node</span>
  <span style="color: #0000ff">&gt;</span>
  <span style="color: #000000"><br/>                 </span>
  <span style="color: #0000ff">&lt;</span>
  <span style="color: #800000">node </span>
  <span style="color: #ff0000">label</span>
  <span style="color: #0000ff">="Three"</span>
  <span style="color: #ff0000"> </span>
  <span style="color: #0000ff">/&gt;</span>
  <span style="color: #000000"><br/>             </span>
  <span style="color: #0000ff">&lt;/</span>
  <span style="color: #800000">mx:XMLList</span>
  <span style="color: #0000ff">&gt;</span>
  <span style="color: #000000"><br/>         </span>
  <span style="color: #0000ff">&lt;/</span>
  <span style="color: #800000">mx:source</span>
  <span style="color: #0000ff">&gt;</span>
  <span style="color: #000000"><br/>     </span>
  <span style="color: #0000ff">&lt;/</span>
  <span style="color: #800000">mx:XMLListCollection</span>
  <span style="color: #0000ff">&gt;</span>
  <span style="color: #000000"><br/> <br/>     </span>
  <span style="color: #0000ff">&lt;</span>
  <span style="color: #800000">mx:ApplicationControlBar </span>
  <span style="color: #ff0000">dock</span>
  <span style="color: #0000ff">="true"</span>
  <span style="color: #0000ff">&gt;</span>
  <span style="color: #000000"><br/>         </span>
  <span style="color: #0000ff">&lt;</span>
  <span style="color: #800000">mx:CheckBox </span>
  <span style="color: #ff0000">id</span>
  <span style="color: #0000ff">="checkBox"</span>
  <span style="color: #ff0000"><br/>                 label</span>
  <span style="color: #0000ff">="doubleClickEnabled:"</span>
  <span style="color: #ff0000"><br/>                 labelPlacement</span>
  <span style="color: #0000ff">="left"</span>
  <span style="color: #ff0000"><br/>                 selected</span>
  <span style="color: #0000ff">="true"</span>
  <span style="color: #ff0000"> </span>
  <span style="color: #0000ff">/&gt;</span>
  <span style="color: #000000"><br/>     </span>
  <span style="color: #0000ff">&lt;/</span>
  <span style="color: #800000">mx:ApplicationControlBar</span>
  <span style="color: #0000ff">&gt;</span>
  <span style="color: #000000"><br/> <br/>     </span>
  <span style="color: #0000ff">&lt;</span>
  <span style="color: #800000">mx:Tree </span>
  <span style="color: #ff0000">id</span>
  <span style="color: #0000ff">="tree"</span>
  <span style="color: #ff0000"><br/>             dataProvider</span>
  <span style="color: #0000ff">="</span>
  <span style="color: #808000">{xmlListColl}</span>
  <span style="color: #0000ff">"</span>
  <span style="color: #ff0000"><br/>             labelField</span>
  <span style="color: #0000ff">="@label"</span>
  <span style="color: #ff0000"><br/>             width</span>
  <span style="color: #0000ff">="250"</span>
  <span style="color: #ff0000"><br/>             rowCount</span>
  <span style="color: #0000ff">="6"</span>
  <span style="color: #ff0000"><br/>             doubleClickEnabled</span>
  <span style="color: #0000ff">="</span>
  <span style="color: #808000">{checkBox.selected}</span>
  <span style="color: #0000ff">"</span>
  <span style="color: #ff0000"><br/>             itemDoubleClick</span>
  <span style="color: #0000ff">="tree_itemDoubleClick(event);"</span>
  <span style="color: #ff0000"><br/>             showScrollTips</span>
  <span style="color: #0000ff">="true"</span>
  <span style="color: #ff0000"> </span>
  <span style="color: #0000ff">/&gt;</span>
  <span style="color: #000000"><br/> <br/> </span>
  <span style="color: #0000ff">&lt;/</span>
  <span style="color: #800000">mx:Application</span>
  <span style="color: #0000ff">&gt;</span>
  <span style="color: #000000"><br/> </span>
 </div> </code>
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