IS IT POSSIBLE TO BACKTEST CUSTOM INDICATORS?

I WANT CREATE AN EA THAT FOCUSES ON 1 TRADE PER PER CURRENCY

EG LETS SAY THAT I LOADED MY EA ON 10 PAIRS

I DONT WANT IT TO TRADE ALL THOSE PAIRS SAMETIME

BUT I WANT IT TO PAUSE ONCE ONE TRADE IS OPEN AND UPAUSE AFTER I CLOSED THAT TRADE OR AFTER THAT TRADE HITS TP

hi yes problem here is that when i click button algo trading, a new button appears , wich is what i want , but then when i click the algo trading button again , the other button supposed to disappear but i cannot make that possible ,below is my link shared/ZJLIb7CJd

hi i cannot seem to get it right here is my link shared/qHF7W89hd

hi im stuck i want to create a button that can provide me with other buttons when i click it and delete those buttons once i click it again at the moment i can only create one that can provide those buttons but cannot delete the buttons when i click it again