Subsequent showing of an Paste HTML dialogs updates the title with some delay. A possible workaround is using the code from this example: <telerik:RadEditor runat="server" ID="RadEditor1" OnClientCommandExecuted="OnClientCommandExecuted"> </telerik:RadEditor> <script type="text/javascript"> function OnClientCommandExecuted(editor, args) { var command = args.get_commandName(); var dialogContainer = editor.get_dialogOpener()._dialogContainers; var dialogName = ""; switch (command) { case "PasteFromWord": case "PasteFromWordNoFontsNoSizes": case "PasteAsHtml": dialogName = "CleanPasteHtmlContent"; break; default: break; } dialogContainer[dialogName].add_pageLoad(updateTitle); dialogContainer[dialogName].add_show(updateTitle); } function updateTitle(sender, args) { var clientParameters = sender.ClientParameters; if (clientParameters && clientParameters.dialogTitle) sender.set_title(clientParameters.dialogTitle) sender.add_pageLoad(updateTitle); sender.add_show(updateTitle); } </script>