FactSytem and FactControls in FlyDisplayView

[DevJhones (Jhones)]

I´m a problem with import FactSytem and FactControls to FlyDisplayView. I need control work parameters via FlyDisplayView, but i dont know why not work.
In top of the code are :
import QGroundControl.FactSystem 1.0
import QGroundControl.FactControls 1.0
and inside the Item have : FactPanelController { id: controller; }

But again, he not take the information of parameters or communication with parameters.

[DevJhones (Jhones)]

I created this item to show the value of the “RTL_ALT” parameters and it does not show