private void clickAdd(object sender, RoutedEventArgs e)
{
var item = ((Button)sender).DataContext;
var itemIndex = userList.Items.IndexOf(item);
string candidate = users[itemIndex];
bool result = controller.addNewFriend(username, candidate);
string msg = "Adding " + candidate + " to friends list";
if (!result)
{
Utils.Instance.errorAndExit("Error trying to access users records");
}
bindNonUserList();
MessageBox.Show(msg + " succeed");
}