You do not mention whether you use C # / VB.NET or Web / WinForms.
WITH#
I do not think that's possible. You will need to implement your own export button.
Something in the lines of this MSDN article
WITH#
// Declare variables and get the export options.
ExportOptions exportOpts = new ExportOptions();
ExcelFormatOptions excelFormatOpts = new ExcelFormatOptions ();
DiskFileDestinationOptions diskOpts = new DiskFileDestinationOptions();
exportOpts = Report.ExportOptions;
// Set the excel format options.
excelFormatOpts.ExcelUseConstantColumnWidth = true;
exportOpts.ExportFormatType = ExportFormatType.Excel;
exportOpts.FormatOptions = excelFormatOpts;
// Set the disk file options and export.
exportOpts.ExportDestinationType = ExportDestinationType.DiskFile;
diskOpts.DiskFileName = fileName;
exportOpts.DestinationOptions = diskOpts;
Report.Export ();
Vb.net
' Declare variables and get the export options.
Dim exportOpts As New ExportOptions()
Dim diskOpts As New DiskFileDestinationOptions()
Dim excelFormatOpts As New ExcelFormatOptions()
exportOpts = Report.ExportOptions
' Set the excel format options.
excelFormatOpts.ExcelTabHasColumnHeadings = true
exportOpts.ExportFormatType = ExportFormatType.Excel
exportOpts.FormatOptions = excelFormatOpts
' Set the export format.
exportOpts.ExportFormatType = ExportFormatType.Excel
exportOpts.ExportDestinationType = ExportDestinationType.DiskFile
' Set the disk file options.
diskOpts.DiskFileName = fileName
exportOpts.DestinationOptions = diskOpts
Report.Export()
Vb.net
DLL . i.e DLL Excel, Excel