private void RaiseSelectTransaction()
  {
    var confirmation = new TransactionSelectionConfirmation(Context);
    SelectTransaction.Raise(confirmation, c =>
    {
      Transaction transaction = c.Transaction;
      if (!c.Confirmed)
      {
        if (transaction != null && transaction.EntityState != EntityState.Detached)
          Context.Transactions.Detach(transaction);
        return;
      }
      Debug.Assert(transaction != null);
      OnTransactionSelected(transaction);
    });
  }

  private void OnTransactionSelected(Transaction transaction)
  {
    if (transaction is ProjectExpense || transaction is ProjectIncome)
    {
      RaiseSelectProject(new ProjectTransaction(transaction));
      mre.WaitOne();
    }

    if (transaction is Investment || transaction is ProjectInvestment)
    {
      RaiseSelectInvestor(new InvestmentTransaction(transaction));
      mre.WaitOne();
    }

    OnInsert(transaction);
  }

  ManualResetEvent mre = new ManualResetEvent(false);
  private void RaiseSelectProject(ProjectTransaction projectTransaction)
  {
    var confirmation = new ProjectSelectionConfirmation(Context);
    SelectProject.Raise(confirmation, c =>
      {
        if (!c.Confirmed)
        {
          Context.Transactions.Detach(projectTransaction.Transaction);
          return;
        }
        var project = c.Project;
        Debug.Assert(project != null && projectTransaction.Transaction.EntityState != EntityState.Detached);
        projectTransaction.Project = project;
        mre.Set();
      });
  }
  private void RaiseSelectInvestor(InvestmentTransaction investmentTransaction)
  {
    var confirmation = new InvestorSelectionConfirmation(Context);
    SelectInvestor.Raise(confirmation, c =>
    {
      if (!c.Confirmed)
      {
        Context.Transactions.Detach(investmentTransaction.Transaction);
        return;
      }
      var investor = c.Investor;
      Debug.Assert(investor != null && investmentTransaction.Transaction.EntityState != EntityState.Detached);
      investmentTransaction.Investor = investor;
      mre.Set();
    });
  }
  private void OnInsert(Transaction transaction)
  {
    EntitySet.Add(transaction);
    Current = transaction;
    EditCurrent();
  }