private void FollowCompany( object o )
{
var stock = new Stock { Provider = "yahoo", Symbol = this.SelectedCompany.Symbol };
StockQuota quota = this.traderGrain.GetQuotaAsync( stock ).Result;
StockItem item = stock.ToStockItem();
item.Quota = quota;
this.Companies.Clear();
this.UpdateStocks( item );
}