ReportViewer.prototype.GenerateReport = ReportViewer.prototype.RefreshReportArea;
"<br /><br />Click Refresh or Preview button to generate the report."
Have in mind that the Preview button is only available when there is at least one report parameter that has the AutoRefresh property set to false. You can also customize the sample message so that it best suits your case.
Give it a try and let us know whether we have correctly understood your query. Any feedback will be welcomed.
the Telerik team
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