Closed Trades

Is there any way to check if a trade is closed manually?

I want to maintain my trades in a list of classes (that handles stoploss, for neatness sake) that hava a reference to the opened position. But I can't delete the entry from the list once the trade is closed without iterating though the list and doing a .Equal().

Can I currently check a Position's state directly to find if it is open or closed?