Xamarin widgets for iOS8, passing parameters to app possible?

Question

iOS

Making a widget for the application, I found that the parameters in ios 8 are not transferred, if the system version is higher, then everything is ok.
I pass parameters like this:

ExtensionContext?.OpenUrl("MyApp://?param=value", (bool success) => {
    if (!success) InfoLabel.Text = "Не удаётся открыть приложение!"; 
  } );

... in the application I catch these parameters like this, in AppDelegate.cs:

public override bool OpenUrl(UIApplication app, NSUrl url, NSDictionary options)
  {
    string[]
        UriParams = url.RelativeString.Split('?'),
        ParamsVal = UriParams?.Length > 1 ? UriParams[1].Split('=') : null;

    Instance.WidgetAction = ParamsVal?.Length > 1
                ? ParamsVal[1]
                : string.Empty;
  } ;

... and here ios8 for some reason the parameters do not arrive.

Answer 1

I'm answering myself, in case it's useful to someone.
It turns out that there are two OpenUrl methods in the AppDelegate, I chose unsuccessfully
instead of
In this case, the parameters are passed correctly.