Function XPLMGetAvionicsHandle 

pub unsafe extern "C" fn XPLMGetAvionicsHandle(
    inDeviceID: XPLMDeviceID,
) -> XPLMAvionicsID

XPLMGetAvionicsHandle

This routine registers no callbacks for a built-in cockpit device, but returns a handle which allows you to interact with it using the Avionics Device API. Use this if you do not wish to intercept drawing, clicks and touchscreen calls to a device, but want to interact with its popup programmatically. This is equivalent to calling XPLMRegisterAvionicsCallbackEx() with NULL for all callbacks.