How to determine equity drawdown in Metatrader 4?

I see that in Metatrader it calculates balance drawdown. Is there a way to calculate open trades drawdown? If not - can we do that in the statement we downloaded from Metatrader with third party applications? Thank you!...

Check these :
https://www.mql5.com/en/code/13242
https://www.mql5.com/en/code/9343
https://www.mql5.com/en/code/8454

Thank you.....