Use style to set tree node open duration
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<!-- styles/TimeFormat.mxml -->
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:mx="library://ns.adobe.com/flex/mx" xmlns:s="library://ns.adobe.com/flex/spark"
creationComplete="initApp()">
<fx:Script>
public function initApp():void {
myTree.setStyle("openDuration", 1000);
myTree.setStyle("paddingLeft", 50);
}
</fx:Script>
<fx:Declarations>
<fx:XMLList id="treeData">
<node label="Mail Box">
<node label="Inbox">
<node label="Marketing" />
<node label="Product Management" />
<node label="Personal" />
</node>
<node label="Outbox">
<node label="Professional" />
<node label="Personal" />
</node>
<node label="Spam" />
<node label="Sent" />
</node>
</fx:XMLList>
</fx:Declarations>
<mx:Panel title="Tree Control Example" width="100%">
<mx:Tree id="myTree" width="100%" labelField="@label"
dataProvider="{treeData}" />
</mx:Panel>
</s:Application>
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