private void gvlHistory_MasterRowExpanded(object sender, CustomMasterRowEventArgs e)
{
GridView view = sender as GridView;
MTSymbol c = (MTSymbol)view.GetRow(e.RowHandle);
GridView childView = view.GetDetailView(e.RowHandle, e.RelationIndex) as GridView;
if (childView != null)
{
symbol = c.Name;
childView.AddNewRow();
}
}