there is a way to activate a control WebView Desktop mode and not Mobile mode?
The WebView doesn't have an inherent desktop or mobile mode. Whether a site provides a mobile or desktop optimised site is generally based on the User Agent header. You can set this in a WebView by creating an HttpWebRequest with the agent you want and then navigating with WebView.NavigateWithHttpRequestMessage.
If you want to mimic a specific browser mode you can find the user agent it uses at several web sites.
string userAgent = "Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.2; ARM; Trident/7.0; Touch; rv:11.0; WPDesktop) like Gecko"
HttpRequestMessage httpRequestMessage = new HttpRequestMessage(
HttpMethod.Post, new Uri("http://whatsmyuseragent.com"));
httpRequestMessage.Headers.Append("User-Agent",userAgent);
myWebView.NavigateWithHttpRequestMessage(httpRequestMessage);