Opening Oauth2 page with self signed certificate causing webview to display security warning

Is there a way I can prevent the security warning popup from displaying. Is there a solution where I can still use my self signed certificate or do I have to use a trusted certificate?

    var authenticator = new OAuth2Authenticator(
            Constants.OAuthAuthCodeLocal.ClientId,
            "",
            Constants.OAuthAuthCodeLocal.AuthorizeUrl,
            Constants.OAuthAuthCodeLocal.RedirectUrl);
        LoadMask = true;
        authenticator.Completed += OnAuthCodeAuthenticationCompleted;
        authenticator.Error += OnAuthCodeAuthenticationError;
        AuthenticationState.Authenticator = authenticator;

        var presenter = new OAuthLoginPresenter();
        presenter.Login(authenticator);