The unbind(eventName, eventHandler)
method of the HTML5 Report Viewer
Unbinds event handlers from the specified event.
function onPageReady(e) {
console.log('page ready!');
}
var reportViewer = $("#reportViewer1").data("telerik_ReportViewer");
reportViewer.bind(telerikReportViewer.Events.PAGE_READY, onPageReady);
// later
reportViewer.unbind(telerikReportViewer.Events.PAGE_READY, onPageReady);