Flash with chroma key demo app

Hi I trying use the chroma Key demo app methods for choosing a colour, I have distilled the app down so that i can choose a colour and save the picked colour, the problem i have run into is turning on the LED flash while the app is running, all the methods
that i can find don't tie in an obvious way because the only activate the LED flash when taking a picture or if video is recording.
https://www.windowsphone.com/en-gb/store/app/chroma-key-demo/4d09c2fb-9902-45d7-a3c6-d1cb78ddd65f
Any help really appropriate.
Regards
Patrick

the only activate the LED flash when taking a picture or if video is recording.
This is correct. Flashlight apps run the video cam to turn the light on. The
TorchControl class is available through the video system.

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