/// <summary>
/// Returns the index of a specified item in the collection
/// </summary>
/// <param name="dataGridViewRow">The DataGridViewRow to locate in the DataGridViewRowCollection</param>
/// <returns>The index of value if it is a DataGridViewRow found in the DataGridViewRowCollection; otherwise, -1.</returns>
public int IndexOf(IDataGridViewRow dataGridViewRow)
{
if (dataGridViewRow == null)
{
throw new ArgumentNullException("dataGridViewRow");
}
DataGridViewRowVWG rowWin = (DataGridViewRowVWG)dataGridViewRow;
return(_rows.IndexOf(rowWin.DataGridViewRow));
}