no way to remove ugly alert

gistfile1.txt

		public WebAuthenticatorController (WebAuthenticator authenticator)
		{
			this.authenticator = authenticator;
			
			authenticator.Error += new EventHandler<AuthenticatorErrorEventArgs> (this.HandleError);
			authenticator.BrowsingCompleted += new EventHandler (this.HandleBrowsingCompleted);
			
			bla bla bla
		}
		
		private void HandleError (object sender, AuthenticatorErrorEventArgs e)
		{
			Action continuation = this.keepTryingAfterError ? new Action (this.BeginLoadingInitialUrl) : new Action (this.Cancel);
			if (e.Exception != null)
			{
				this.ShowError ("Authentication Error", e.Exception, continuation);
				return;
			}
			this.ShowError ("Authentication Error", e.Message, continuation);
		}