int PositionLastOpenedBarIndex(string          f_symbol="",         // instrument finansowy
                               int             f_cmd=-1,            // typ pozycji
                               int             f_magic=-1,          // identyfikator
                               ENUM_TIMEFRAMES f_tf=PERIOD_CURRENT) // przedział czasowy
  {
   if(f_cmd==OP_BUYLIMIT || f_cmd==OP_SELLLIMIT ||
      f_cmd==OP_BUYSTOP  || f_cmd==OP_SELLSTOP)
      return -1;
//---
   datetime f_timeOpen=0;
   for(int i=OrdersTotal()-1; i>=0; i--)
      if(OrderSelect(i,SELECT_BY_POS,MODE_TRADES))
         if((f_symbol==OrderSymbol()      || f_symbol=="") &&
            (f_cmd   ==OrderType()        || f_cmd==-1)    &&
            (f_magic ==OrderMagicNumber() || f_magic==-1))
            if(OrderOpenTime()>f_timeOpen)
               f_timeOpen=OrderOpenTime();
//---
   if(f_timeOpen==0)
      return -1;
   else
      return iBarShift(f_symbol,f_tf,f_timeOpen,true);
  }