Finally i could make it.... Thanks to all who helped me to  do this... Thanks
a lot.
i solved two problems one is extending tree and one is finding parent of a
tree node selected. i am giving code here for ref"

Tree
<sx:tree id="tree1" rootNode="%{rootField}"
childCollectionProperty="children" nodeIdProperty="fieldID"
 nodeTitleProperty="fieldName" treeSelectedTopic="treeSelected" 
expandedNotifyTopics="treeExpanded" >
</sx:tree>

Tree Expand function which will be called on window load event 
window.onload=function(){
  var nodes =dojo.widget.manager.getWidgetsByType('struts:StrutsTreeNode');
                for( var i=0; i < nodes.length; i++){
                    nodes[i].expand();
                }
}

finding parent of a node selected .

function treeNodeSelected(message) {
                alert("Parent Node = "+message.node.parent.widgetId);
                document.form1.parentFieldID.value=message.node.parent.widgetId;
}
dojo.event.topic.subscribe("treeSelected",this,treeNodeSelected);

Have  Nice time...

Ganesh123 wrote:
> 
> Hi
>      Is it possible to display a tree expanded by default?
> I am using struts 2.1.2 dojo-plugin to create the tree structure. any one
> used tree...plz help me
> 
> 

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