How can I compile;

Highest high since the order began;

in this modifyorder;

OrderModify(OrderTicket(),OrderOpenPrice(),(Highest high since the order began)-Point*TrailingStop,OrderTakeProfit(),0,Green);

Thanks

int nbarsOpen = iBarShift(NULL, 0, orderOpenTime);
double hi = High[ArrayMaximum(High, nbarsOpen, 0)];