Yes Thanks,

It's no so dificult :

I Just put NavigateUrl = "javascript:trv_SelectNode();"

But i have a little problem, and I don't know Why.

 When i cliked in a node for the first time, (after expand his parentNode.)

The javascript code don't works, but after the first click the javascript code works.

I put my JS Code, if you can help me.

<script class=st type=">
2    
3     var previousSourceSelectedNode = null;
4    
5            window.onload = function()
6            {
7                 trv_SelectNode();
8            }
9    
10           function trv_SelectNode()
11           {
12               var treeview = document.getElementById("&lt;%=Trv_Campaign.ClientID %>");
13               var treeLinks = treeview.getElementsByTagName("a");
14   
15                for(i=0;i<treeLinks.length;i++)
16                {
17                     if (treeLinks[i].firstChild != null)
18                     {
19                         if(treeLinks[i].firstChild.tagName != "IMG")
20                         {
21                           treeLinks[i].onclick = function()
22                           {
23                              trvSource_OnClick(this);
24                           }
25                         }
26                     }
27                 }
28   
29           }
30   
31           function trvSource_OnClick(trv)
32           {
33               if(previousSourceSelectedNode == null) //Noeud cliqué pour la premiere fois
34               {
35                  previousSourceSelectedNode = trv;
36               }
37               else  //deselect previous node
38               {
39                   previousSourceSelectedNode.className = "nodeNotSelected";
40                   previousSourceSelectedNode = trv;
41               }
42               TreeView_SelectNode(_Data,trv,trv.id.toString());
43   
44               trv.className = "nodeSelected";   //met le style a "nodeselected"
45   
46           }
47   
48           </script>


      

    


52        .nodeSelected{text-decoration:none;background-color:#C5C2B8;BorderStyle=Solid;BorderWidth:1px;}
53        .nodeNotSelected{text-decoration:none;background-color:none;}
54

<script class=st type="> 
	 	
	 	var previousSourceSelectedNode = null; 
	 	

        window.onload = function()
        {
             trv_SelectNode();
        }  
        
        function trv_SelectNode()
        {
            var treeview = document.getElementById("&lt;%=Trv_Campaign.ClientID %>");
             var treeLinks = treeview.getElementsByTagName("a");

              
             for(i=0;iif (treeLinks[i].firstChild != null)
                  {
                      if(treeLinks[i].firstChild.tagName != "IMG")
                      {
                        treeLinks[i].onclick = function()
                        {
                           trvSource_OnClick(this);
                        }
                      }
                  }
              }

        }
        
        function trvSource_OnClick(trv) 
        {
            if(previousSourceSelectedNode == null) //Noeud cliqué pour la premiere fois
            {
               previousSourceSelectedNode = trv;
            }
            else  //deselect previous node
            {
                previousSourceSelectedNode.className = "nodeNotSelected";
                previousSourceSelectedNode = trv;
            }
            TreeView_SelectNode(<%=Trv_Campaign.ClientID %>_Data,trv,trv.id.toString());
        
            trv.className = "nodeSelected";   //met le style a "nodeselected"

        }
         
        
        </script>