Access selected row combobox Name of datagrid in silverlight button click event

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Silverlight

private void btnUpdate_Click(object sender, RoutedEventArgs e)
{
IsUpdated = true;
Button btn = ((Button)e.OriginalSource);
var gh=btn.DataContext as Employee;

foreach (DataGridColumn col in dgCustomer.Columns)
{
if (Convert.ToString(col.Header).Contains("Combo"))
{
//here i need to get the combobox name
}
}

btn.Content = "Update";
dgCustomer.Columns[1].IsReadOnly = false;
dgCustomer.Columns[2].IsReadOnly = false;
dgCustomer.Columns[3].IsReadOnly = false;
dgCustomer.Columns[4].IsReadOnly = false;

}



I need to change the combobox IshittextVisible property when update button click in datagrid.

I'm not able to find the grid row in selectionchanged event or keydown event.