What is an order of PendingOrders.Filled and Positions.Opened ?

Hi!

I want to check the position when some order triggers. Is an updated position available when the event PendingOrders.Filled fires?

Assume the script places the order when the position is flat.
...

ExecuteMarketOrder(....);

.....

what is an order of events PendingOrders.Filled and Positions.Opened?
Is PendingOrders.Filled fired before Positions.Opened?
or
Is Positions.Opened fired before PendingOrders.Filled?
or
Is order of these events not defined?

Thanks.