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TreeSelector继承于HtmlWidget，其作用主要是处理Tree的Select的功能。
1：具有selectedNode的属性
2：默认的事件名有：
eventNamesDefault: {
select : "select",
destroy : "destroy",
deselect : "deselect",
dblselect: "dblselect" // select already selected node.. Edit or whatever
},
3：注意这段代码：eventNames的值。
initialize: function() {
for(name in this.eventNamesDefault) {
if (dojo.lang.isUndefined(this.eventNames[name])) {
this.eventNames[name] = this.widgetId+"/"+this.eventNamesDefault[name];
}
}
},
4：监听树的事件：
listenTree: function(tree) {
//标题和图标的click都绑定到Selector的select事件。
dojo.event.topic.subscribe(tree.eventNames.titleClick, this, "select");
dojo.event.topic.subscribe(tree.eventNames.iconClick, this, "select");
dojo.event.topic.subscribe(tree.eventNames.collapse, this, "onCollapse");
dojo.event.topic.subscribe(tree.eventNames.moveFrom, this, "onMoveFrom");
dojo.event.topic.subscribe(tree.eventNames.removeNode, this, "onRemoveNode");
dojo.event.topic.subscribe(tree.eventNames.treeDestroy, this, "onTreeDestroy");
/* remember all my trees to deselect when element is movedFrom them */
this.listenedTrees.push(tree);
},
5：
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