protected void Page_Load(object sender, EventArgs e)
{
// create a new persistency manager
NPersistencyManager persistencyManager = new NPersistencyManager();
 // load a drawing from a file
NDrawingDocument drawing = persistencyManager.LoadDrawingFromFile("C:\\example.ndx");
 // display the document into the view
NDrawingView1.Document = drawing;
}

protected void NDrawingView1_AsyncClick(object sender, EventArgs e)
{
  ScriptManager.RegisterStartupScript(this, typeof(string), "open", "test();", true);
}

protected void NDrawingView1_QueryAjaxTools(object sender, EventArgs e)
 {
   NDrawingView1.AjaxTools.Add(new NAjaxMouseClickCallbackTool(true));
 }