Why after I set the Click event of the NPanAndZoomControl's Click event, but when I run the program ,After I click on the region of the control, the event does not respond.

How should I deal with this , I would be really glad for your reply.

the main code is:

  private Nevron.Diagram.WinForm.NPanAndZoomControl PanAndZoom; 

 this.PanAndZoom.Click += new System.EventHandler(this.PanAndZoom_Click);

   private void PanAndZoom_Click(object sender, EventArgs e)
        {
            NPointF p = PanAndZoom.ViewportPreview.Band.Center;
            p.X += 10;
            p.Y += 10;
            PanAndZoom.ViewportPreview.Band.Center = p;
            PanAndZoom.UpdateMasterView();
        }