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SelectViewer(...) return always false

Hi, i try to pass to digitalEyewear custom params with  

Vuforia.ICustomViewerParameters par = Vuforia.Device.Instance.CreateCustomViewerParameters(...);

setting params fields with my custom params and then 

Vuforia.Device.Instance.SelectViewer(par);   but the method return false. 

So i try to  chage viewer choosing by a viewer in the list with 

Vuforia.Device.Instance.SelectViewer(Vuforia.Device.Instance.GetViewerList().Get(1));

but the method return false. 

Why it return always false?

How can i set custom parameteres ?

 

Thanks in advance for reply