protected override void OnAddressChange(CefBrowser browser, CefFrame frame, string url)
 {
     if (frame.IsMain)
     {
         _core.InvokeIfRequired(() => _core.OnAddressChanged(new AddressChangedEventArgs(frame, url)));
     }
 }
 protected override void OnAddressChange(CefBrowser browser, CefFrame frame, string url)
 {
     if (frame.IsMain)
     {
         _core.OnAddressChanged(url);
     }
 }