On opening the TemplateManager dialog under IE11 the loading panel is not hiding.

Due to this issue, the user cannot operate with this dialog under IE11.

The following example setup is resolving the issue:

<telerik:RadEditor runat="server" ID="RadEditor1"
    OnClientCommandExecuted="OnClientCommandExecuted">
</telerik:RadEditor>

<script type="text/javascript">
    function OnClientCommandExecuted(editor, args) {
        var commandName = args.get_commandName();

        if (commandName === "TemplateManager" && $telerik.isIE) {
            var dialog = editor.get_dialogOpener()._dialogContainers["TemplateManager"];

            dialog.add_activate(fixDialog);
        }
    }

    function fixDialog(dialog) {
        dialog._onWindowUrlChanged();
        dialog.remove_activate(fixDialog);
    }
</script>