Bars.BarOpened called on each tick instead of each bar

Hi, I'm trying to create indicator that calculates values on each bar, instead of each tick. I tried to write a simple indicator, which is making use of Bars.BarOpened event, but this event is called each tick, instead of each bar.

using System;
using cAlgo.API;
using cAlgo.API.Internals;
using cAlgo.API.Indicators;
using cAlgo.Indicators;

namespace cAlgo
{
    [Indicator(IsOverlay = true, TimeZone = TimeZones.UTC, AccessRights = AccessRights.None)]
    public class awdwaa : Indicator
    {
        protected override void Initialize()
        {
            Bars.BarOpened += OnBarsBarOpened;
        }

        void OnBarsBarOpened(BarOpenedEventArgs obj)
        {
            Print("New bar created for " + obj.Bars.SymbolName + " at " + obj.Bars.Last(0).OpenTime);
        }

        public override void Calculate(int index)
        {
        }
    }
}

As you can see, event is triggered on each tick, instead of each bar. How to solve this?