Engine Fire extinguishers only in panel view?

[lizz]

Hi Guys, I hope someone can help me with the following question:
 

I am building a home cockpit flight simulator that is interfaced to 3 computers, 2 for the outside views (1 PC is master) end 1 PC that runs all the instrument software e.g. EFIS panel builder and XHSI. This PC also runs SIOC that interfaces with all the annunciators, switches etc.

All works fine but today I was strugling with the engine fire annunciations and extinguishers.

I have set it  up to work as follows:
When an engine fire occurs SIOC reads this through a dataref (UIPCX) for the internal X-plane annunicator and switches ON the Fire warning light in the cockpit ( in fact it is a lighted pushbutton switch). In this situation when I press the Fire warning pushbutton switch the light goes out AND the bottle is emptied through the fire extinguisher dataref.
This all works great as long as the instrument panel of the aircraft is in view???!!!

When I switch to "view with nothing" (which I want of course as I'm in a flight simulator) the extinguishing command from the pushbutton switch is not processed by X-plane.

Only when I switch to  panel view (W key) I can fire the bottles.......

I noted that it is not aircraft depended as I tried a different aircraft type and get identical behaviour.

 

Is there anyone here who has a clue as to what is happening here?

 

Regards, Lizz