void RegisterPagesVM()
{
CustomDependencyServiceExtended.RegisterFactory <MainPage, MainPageVM>();
}
void RegisterServices()
{
CustomDependencyServiceExtended.RegisterFactory <InstanceCreator, InstanceCreator>();
CustomDependencyServiceExtended.RegisterFactory <AService, SomeConcreteService>();
// CustomDependencyServiceExtended.RegisterFactory<AService, SomeConreteServiceWithConst>(() => new SomeConreteServiceWithConst(new SomeClass()));
}