let $T = Telerik.Web.UI;

if ($T) {
    let originalFunction = $T.Button.PostbackFunctionality.prototype._postback;

    $T.Button.PostbackFunctionality.prototype._postback = function () {
        var that = this,
            o = that.options,
            cState = o.controlState;

        if (!o.postbackReference) {
            var shouldPostback = o.submitBtn && (cState.splitButtonClicked || !that._isInput);

            if (shouldPostback) {
                __doPostBack(o.controlId, cState.eventArguments);
            }

            return !shouldPostback;
        }

        var postbackFunction = o.postbackReference.replace('WebForm_DoPostBackWithOptions', 'this.WebForm_DoPostBackWithOptions');

        postbackFunction = postbackFunction.replace('RadButtonEventArguments', cState.eventArguments);

        return eval(postbackFunction);
    }
}