update datasource in lookup combo box is changing the current field value

See more:

C#

SQL-Server

combobox

I have a combo box which is data bind to its “selected value” property and datasource is bind to a view in SQL database. It works fine, when I select and change value everything is updated correctly; however I have a button which should allow to user to add value to the lookup datasource.
My problem is that whenever user adds new item, the datasource is updated and in my lookup combobox the first value from the list is selected always, no matter if previously another value was selected in my combo.
Here is my button click event:

private void addPersonBtn_Click(object sender, EventArgs e)
{

        EditPerson frmEditPerson = new EditPerson();
        if (frmEditPerson.ShowDialog() == System.Windows.Forms.DialogResult.OK)
        {
            ownerComboBox.BeginUpdate();
            this.viewLookupPersonTableAdapter.Fill(this.personDataSet.viewLookupPerson);
            ownerComboBox.EndUpdate();
        }
        frmEditPerson.Dispose();
}

Problem is that as soon as viewLookupPerson is filled, the value in my combo is changed to the first value in the list.
I tried also to store the value of selected item, like this:

DataRowView rw = (DataRowView) ownerComboBox.SelectedItem;
ownerComboBox.BeginUpdate();
this.viewLookupPersonTableAdapter.Fill(this.personDataSet.viewLookupPerson);
ownerComboBox.EndUpdate();
ownerComboBox.SelectedItem = rw;

but still does not work… I know I could iterate through the combo box but there has to be an easier solution…