There are probably other ways and better ways to do this but this works well for me and it seems not to violate MVC too bad :)

//CustomersListForm.cs

public class CustomersListForm
{
    private CustomerController myController;

    public CustomersListForm()
    {
       InitializeComponents();
        myController = new CUstomer Controller();
    }

    private void CustomersListForm_Load(object sender, EventArgs e)
    {
        PopulateCustomerGrid();
    }

    public void PopulateCustomerGrid()
    {
          customersGrid.DataSource = myController.GetCustomers();
    }

    private void CustomersGrid_SelChange(object sender, EventArgs e)
    {
         if(CustomersGrid.RowSel != -1)
        {
            Int32 customerId = Int32.Parse(CustomersGrid[CustomersGrid.RowSel,1].ToString();
            myController.GetCustomerById(customerId);
        }
    }

    public void EditCustomer()
    {
         CustomerForm form = new CustomerForm(myController);
         form.ShowDialog();
         PopulateCustomerGrid();
   
    }

    public void AddCustomer()
    {
         myController.CreateCustomer();
         CustomerForm form = new CustomerForm(myController);
         form.ShowDialog();
         PopulateCustomerGrid();        
    }

}

// CustomerController.cs

public class CustomerController
{
      private Customer currentCustomer;
      private PersistenceManager myPM = PersistenceManager.DefaultManager;

      public Customer CurrentCustomer
      {
           get{
                 return currentCustomer;
           }
           set{
                currentCustomer = value;
           }
       }

       public void CreateCustomer()
       {
           currentMember = Customer.Create(myPM);
       }

       public void GetCustomerById(Int32 customerId)
       {
            RdbQuery query = new RdbQuery(typeof(Customer));
            query.AddClause(Customer.CustomerIdEntityColumn, EntityQueryOp.EQ, customerId);
            currentCustomer = myPM.GetEntity<Customer>(query);
       }

       public void SaveCustomer()
       {
             try{
               myPM.SaveChanges();
             }
             catch(SaveException ex)
      {
      }
       }

}

// CustomerForm.cs

public class CustomerForm
{
 private CustomerController myController;

        public CustomerForm(CustomerController controller)
        {
              InitializeComponents();
              myController = controller;
        }

    private void CustomerForm_Load(object sender, EventArgs e)
     {
       CustomerBS.DataSource = myController.CurrentCustomer;
     }

        private void SaveButton_Click(object sender, EventArgs e)
        {
               myController.SaveCustomer();
               this.Close();
         }

       
}
     

  When I click Add or Edit, a second form is open to create a new Kasa or edit the selected one.
  Of course, if the user cancel the frmKasa form, the record is not added or edited.
  I want
       - How to passing/accessing selected record from browse form one form in another form
       - After that he saves the changes (PM.SaveChanges) and the current form is closing and the old form with the
         DataGridView gets the focus again. At the point the user is saving the data I want to refresh the data in
         the form with the DataGridView. if the added record I have setting position added record in datagrid.