how to change instrument on chart by code

[emilien]

I am writing an indicator (of class Indicator).
I'd like to know if it is possible to change the underlying instrument of an indicator by code. For example, lets say I have this indicator object currently works on instrument X. Now I need to work on instrument Y but as Y hasn't been loaded to the chart window by user, I want to make use of the indicator on X but change the instrument to Y. I'm not sure how it can be done though.
Thanks.

[NinjaTrader_Jim]

Hello emilien,

Thanks for writing in.

You will not be able to change the primary data series of an indicator indicator through a chart. This can be done manually within NinjaScript, however.

Within NinjaScript, you may add an additional Data Series to a strategy or indicator to perform calculations on a data series other than the primary one set by the chart or window.

There is a sample strategy that outlines this which may be of use to you:

http://ninjatrader.com/support/forum/showthread.php?t=6652

Please also take the time to read the documentation for the components listed within as well as the documentation on creating NinjaScript for Multi-Time Frame & Instruments:

http://ninjatrader.com/support/helpGuides/nt8/en-us/multi-time_frame__instruments.htm

If you have any further questions, please don't hesitate to ask.