Refresh Custom Indicator

I've created a custom indicator which has it's own public variables and properties which are calculated based on the chart bars however it does not has an IndicatorDataSeries output (usually called 'Result' on the code samples).

When I place it on a chart, it calculate itself on all history bars and on each new tick which is exactly the way I want it to perform.

The problem begins when I use it from my cBot - the Calculate method is never called - not on history and not on new ticks. The only way I found to bypass it is to add a IndicatorDataSeries output parameter which i called Result and from the my cBot call on each tick call MyInd.Result.LastValue. This makes the indicator acts OK.

Is there a more simple way to make the indicator calculate itself without adding an unnecessary parameter and call it on each tick?

Thanks