杂整阿，我怎么取得选择复选框的所有数据阿
<t:tree2 id="clientTree" value="#{QueryAreaAct.treeData}"
var="node" varNodeToggler="t" clientSideToggle="false"
imageLocation="../images">
<f:facet name="type">
<h:panelGroup>
<f:facet name="expand">
<t:graphicImage value="../images/yellow-folder-open.png"
rendered="#{t.nodeExpanded}" border="0" />
</f:facet>
<f:facet name="collapse">
<t:graphicImage value="../images/yellow-folder-closed.png"
rendered="#{!t.nodeExpanded}" border="0" />
</f:facet>
<t:selectManyCheckbox id="selected" layout="spread"
immediate="true" value="#{QueryAreaAct.listCheckNode}">
<t:treeCheckbox id="itemCheck" for="selected"
itemValue="#{node.description}"
itemLabel="#{node.description}"/>
</t:selectManyCheckbox>
</h:panelGroup>
</f:facet>
<f:facet name="name">
<h:panelGroup>
<t:selectManyCheckbox id="selected" layout="spread"
immediate="true" value="#{QueryAreaAct.listCheckNode}">
<t:treeCheckbox id="itemCheck" for="selected"
itemValue="#{node.description}"
itemLabel="#{node.description}"/>
</t:selectManyCheckbox>
</h:panelGroup>

</f:facet>
</t:tree2>