protected override void Dispose(bool disposing)
        {
            if (_disposed)
            {
                return;
            }

            if (disposing)
            {
                _disposed = true;

                _page = null;

                if (!_fragmentManager.IsDestroyed)
                {
                    FragmentTransaction transaction = _fragmentManager.BeginTransactionEx();

                    foreach (Fragment fragment in _fragments)
                    {
                        transaction.RemoveEx(fragment);
                        transaction.SetTransitionEx((int)FragmentTransit.None);
                    }

                    transaction.CommitAllowingStateLossEx();

                    _fragmentManager.ExecutePendingTransactionsEx();

                    _fragments       = null;
                    _fragmentManager = null;
                }
            }

            base.Dispose(disposing);
        }