IdentityModel.OidcClient RefreshTokenDelegatingHander

Question

I'm trying to use RefreshTokenDelegatingHander but couldn't find any proper way or sample yet with Xamarin.forms. Has any one got any success? Here is what i tried:

var options = new OidcClientOptions
            {
                Browser = browser,
                RedirectUri = IdentityConstants.RedirectUri,
                Authority = IdentityConstants.Authority,
                ClientId = IdentityConstants.ClientId,
                ClientSecret = IdentityConstants.ClientSecret,
                ResponseMode = OidcClientOptions.AuthorizeResponseMode.Redirect,
                Scope = IdentityConstants.Scope,
                RefreshTokenInnerHttpHandler = new HttpClientHandler()
            };

            _client = new OidcClient(options);

and inside my Login method after:

_result = await _client.LoginAsync(new LoginRequest());

I'm trying to use it with following:

var tokenResult = new RefreshTokenDelegatingHandler(_client, _result.AccessToken, _result.RefreshToken,_result.RefreshTokenHandler);
tokenResult.TokenRefreshed += OnTokenRefreshed; //This one is never called

Any one has any idea? or any example?