Price Alert

[Andreano]

I have a task: I need to modify stop order based on Price alert.
As soon as current market price reaches predefined price - modify stop order.
What are the ways to do that?
So far I can see that I would have to connect to tick price data and check tick by tick if necessary price has been reached.

I tried to find something in API which would allow to set up alert and then some callback that would be called on alert - but did not found .
Is there any other built-in ways to do that?

I can see PriceAlert indicator - but it would create alert for alert window, where I need to call some method of Strategy, that would modify stop order.

I am new to NinjaTrader, did try to search this topic through search forum, but found no results, that will answer my question.
I will appreciate any help.