<script type="text/javascript">
   var activenode = null;
   function $(id){return document.getElementById(id);}
   function AppySetting(){
      if (activenode!=null){
          activenode.setAttribute('AllowAdd'   ,(($('AllowAdd'   ).checked)? 'True':'False'));
          activenode.setAttribute('AllowEdit'  ,(($('AllowEdit'  ).checked)? 'True':'False'));
          activenode.setAttribute('AllowDelete',(($('AllowDelete').checked)? 'True':'False'));
      }
   }
   function OnClientNodeClicked(sender, args)
   {  
        activenode = args.get_node().get_attributes();
        $('AllowAdd'   ).checked = activenode.getAttribute('AllowAdd'   )=='True';
        $('AllowEdit'  ).checked = activenode.getAttribute('AllowEdit'  )=='True';
        $('AllowDelete').checked = activenode.getAttribute('AllowDelete')=='True';
   }
 </script>

server code :
aspx page
<telerik:RadTreeView id="RadTreeViewBackOffice" runat="server" CheckBoxes="True" TriStateCheckBoxes="true" CheckChildNodes="true" OnNodeDataBound="OnNodeDataBound"  OnClientNodeClicked="OnClientNodeClicked" OnClientNodeChecking="OnClientNodeClicked" />

code behind :

           e.Node.Attributes.Add("AllowDelete" ,"True");
} 

protected void OnClick(object sender, EventArgs e )

 {
  foreach(RadTreeNode Node in RadTreeViewBackOffice.CheckedNodes){
         Response.Write(Node.Attributes["AllowAdd"]);
  }

telerik:RadTreeView ID="RadTreeView1" runat="server" CheckBoxes="true"

CheckChildNodes="true" TriStateCheckBoxes="true" Skin="Outlook" ShowLineImages="false"

Style="margin-bottom: 10px">

</telerik:RadTreeView>

"~/zz_Portal/KdsDimensionLoader.aspx";

radTreeView.WebServiceSettings.Method =

"GetKdsDimElements";

node.ExpandMode =

TreeNodeExpandMode.WebService;

WebMethod]

public static RadTreeNodeData[] GetKdsDimElements(RadTreeNodeData node)

{

List<RadTreeNodeData> result = new List<RadTreeNodeData>();

DataRow kdsDimSlicer = MDXSlicers.FindSlicerById("11");

MetaData metaData1 = (MetaData)HttpContext.Current.Session[SessionVariables.MetaData.ToString()];

if (metaData1 != null)

{

string dimName = (string)kdsDimSlicer[MDXSlicers.DIMENSION];

string hierarchyName = (string)kdsDimSlicer[MDXSlicers.HIERARCHY];

DataTable table = metaData1.GetMembers(dimName, hierarchyName);

DataRow[] rows = table.Select("ParentUniqueName = '" + node.Value.Replace("'", "''") + "'");

foreach (DataRow row in rows)

{

RadTreeNodeData childNode = new RadTreeNodeData();

childNode.Text = row[

"Name"].ToString();

childNode.Value = row[

"UniqueName"].ToString();

DataRow[] checkChilds = table.Select("ParentUniqueName = '" + childNode.Value.Replace("'", "''") + "'");

if (checkChilds.Length > 0)

{

childNode.ExpandMode =

TreeNodeExpandMode.WebService;

}

result.Add(childNode);

}

}

return result.ToArray();

}