private void HandleAuthenticationRequiredMessage(AuthenticationRequiredMessage msg)
{
var model = new CredentialsModel {PromptMessage = msg.Message};
var credentialsDialog = new CredentialsDialog (model);
var dialogResult = credentialsDialog.ShowDialog();
msg.Callback(dialogResult, model.UserName, model.Password);
}
public CredentialsDialog(CredentialsModel viewModel)
{
InitializeComponent();
_viewModel = viewModel;
DataContext = _viewModel;
}