Hello,

Sorry I didn't mention the Fragment class is inherited "Intersoft.Crosslight.Android.Fragment<customViewModel>". Error message "Cannot convert type 'customViewModel' to 'Intersoft.Crosslight.Android.Fragment<Prototype.Ems.ViewModels.customViewModel>' via a reference conversion, boxing conversion, unboxing conversion, wrapping conversion, or null type conversion" occurred when I use safe-cast statment on design time. 

It's ok when I code below:

customViewModel context = Owner as customViewModel;

It seemed error when I code below on runtime:

customViewModel context = Owner as customViewModel;

Fragment<customViewModel> customFragment = context.Context as Fragment<customViewModel>;

I still can't grab the Fragment<customViewModel> to start my Android AnimationDrawable object, thank you very much.