Databinding is not working properly for nested object

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C#

WinForms

C#4.0

data-binding

I save a "SalesReturn" object in my library which has few objects as property.

namespace BusinessObjects
{
public class SalesReturn : ObjectBase
{

    private Int32 pSalesReturnId;
    private SalesPerson pSalesPersonDetails=new SalesPerson();
    private PackSize pPackSizeDetails=new PackSize();

    public Int32 SalesReturnId
    {
        get { return pSalesReturnId; }
        set
        {
            if (!value.Equals(pSalesReturnId))
            {
                pSalesReturnId = value;
                PropertyHasChanged("SalesReturnId");
            }
        }
    }

    public SalesPerson SalesPersonDetails
    {
        get { return pSalesPersonDetails; }
        set
        {
            if (!value.Equals(pSalesPersonDetails))
            {
                pSalesPersonDetails = value;
                PropertyHasChanged("SalesPersonDetails");
            }
        }
    }

    public PackSize PackSizeDetails
    {
        get { return pPackSizeDetails; }
        set
        {
            if (!value.Equals(pPackSizeDetails))
            {
                pPackSizeDetails = value;
                PropertyHasChanged("PackSizeDetails");
            }
        }
    }

    public SalesReturn()
    {
    }


    public static SalesReturn FillEntity(SQLiteDataReader Reader,SQLiteConnection Connection)
    {
        SalesReturn salesreturn = new SalesReturn();
        salesreturn.pSalesReturnId = Convert.ToInt32(Reader["SalesReturnId"]);
        salesreturn.SalesPersonDetails =SalesPerson.GetEntity( Convert.ToInt32(Reader["SalesPersonId"]),Connection);
        salesreturn.pPackSizeDetails =PackSize.GetEntity( Convert.ToInt32(Reader["PackSizeId"]),Connection);
        salesreturn.MarkOld();
        return salesreturn;
    }

    public static SalesReturn GetEntity(int salesReturnId, string ConnectionString)
    {
        SalesReturn salesreturn = null;
        using (SQLiteConnection Connection = new SQLiteConnection(ConnectionString))
        {
            Connection.Open();
            string sqlSelect = "SELECT SalesReturnId, SalesPersonId, PackSizeId FROM tblSalesReturn WHERE SalesReturnId=" + salesReturnId + "";
            using (SQLiteCommand cmd = new SQLiteCommand(sqlSelect, Connection))
            {
                SQLiteDataReader Reader = cmd.ExecuteReader();
                if (Reader.HasRows)
                {
                    Reader.Read();
                    salesreturn = FillEntity(Reader, Connection);
                }
                if (!Reader.IsClosed)
                {
                    Reader.Close();
                }
            }
            Connection.Close();
        }
        return salesreturn;
    }

}
}

I have a WinForm databound to this object. I am using a method to bind to that object.

private void AddDataBindings()
{
    bsSalesPerson.DataSource = SalesPerson.GetComboList(GlobalVariables.ConnectionString);
    cmbSalesPersonDetails.DataSource = bsSalesPerson;
    cmbSalesPersonDetails.ValueMember = "SalesPersonId";
    cmbSalesPersonDetails.DisplayMember = "FullNameInEnglish";

    bsPackSize.DataSource = PackSize.GetComboList(GlobalVariables.ConnectionString);
    cmbPackSizeDetails.DataSource = bsPackSize;
    cmbPackSizeDetails.ValueMember = "PackSizeId";
    cmbPackSizeDetails.DisplayMember = "ProductPackSize";
    lblUnitName.DataBindings.Add("Text", bsPackSize, "UnitName");

    bsCurrentEntity.DataSource = typeof(SalesReturn);
    cmbSalesPersonDetails.DataBindings.Add("SelectedItem", bsCurrentEntity, "SalesPersonDetails",false,DataSourceUpdateMode.OnPropertyChanged);
    cmbPackSizeDetails.DataBindings.Add("SelectedItem", bsCurrentEntity, "PackSizeDetails", false, DataSourceUpdateMode.OnPropertyChanged);
}

My problem is when i retrieve an existing "SalesReturn" object from database, databound comboboxes are not showing the appropriate value.

private void LoadObject(object sender, EventArgs e)
{
        CurrentEntity = SalesReturn.GetEntity(salesReturnId, GlobalVariables.ConnectionString);
        bsCurrentEntity.DataSource = CurrentEntity;
}

I could not identify the problem. Would you please help me to identify it?