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<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
layout="vertical"
verticalAlign="middle"
backgroundColor="white">
<mx:Script>
<![CDATA[
private function openAllNodes():void {
tree.openItems = dp..node;
}
private function closeAllNodes():void {
tree.openItems = [];
}
]]>
</mx:Script>
<mx:XML id="dp">
<root>
<node label="Parent 1">
<node label="Child 1" />
<node label="Child 2">
<node label="Grandchild 1" />
<node label="Grandchild 2" />
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