Control[] ctrl = reportViewer1.Controls.Find("toolStrip1", true);
            foreach (Control c in ctrl)
            {
                ToolStripButton btn = new ToolStripButton();
                if (c.GetType() == typeof(ToolStrip))
                {
                    ToolStrip ts = (ToolStrip) c;
                    btn.Image = Image.FromFile("C:\\...\\Visual Studio 2010\\Projects\\...{project directory}...\\Properties\\saveHS.bmp");
                    btn.Click += new EventHandler(btn_Click);
                    ts .Items.Insert(15, btn);
                    ts.Refresh();
                }
            }
            reportViewer1.Refresh();
        }

        void btn_Click(object sender, EventArgs e)
        {
            reportViewer1.ExportDialog(reportViewer1.LocalReport.ListRenderingExtensions()[2]);
        }