Position.AvgPrice Real Value

[daven]

I have always assumed that when calling "Position.AvgPrice" for position one gets the average ENTRY price for a position, but judging by how my strategy is behaving it appears that I am actually getting the average Price of my combined positions based on what they were at the last bar close. My problem is I am using the above price as a limit order for the remaining runner after I take off two contracts at a first profit target. Here is the code I am using.

if (Position.MarketPosition == MarketPosition.Short
                && Position.Quantity == 1)
            {
                ExitShortLimit(Position.AvgPrice , "SBreakEven Exit", "SRunner");
            }

The problem is, this order is executing on the next bar after I close out the first two contracts and the price it is closing at, is generally the same as my first profit exit. If, as I suspect, the Position.AvgPrice gives us the avg price of the position at the time it is called, then is there a way to get the average entry price of a position? Perhaps store a variable and refer to it later? Or better yet, there is an actual command that provides the average entry price of a position. It seems that would be a very useful command if you don't already have it.
Thanks
DaveN