protected void RadPivotGrid1_ItemCreated(object sender, PivotGridItemCreatedEventArgs e)
    {
        if (e.Item is PivotGridAggregateItem)
        {
            foreach (Control control in e.Item.Controls)
            {
                if (control is PivotGridColumnZone)
                {
                    RadButton button = new RadButton()
                    {
                        ID = "PivotGridExportButton",
                        Text = "Save as Excel"
                    };
                    button.Icon.PrimaryIconCssClass = "rbSave";
                    button.Style["float"] = "right";
                    button.Click += (s, a) =>
                    {
                        RadPivotGrid1.ExportToExcel();
                    };
                    control.Controls.Add(button);
                    break;
                }
            }
        }
    }