public void DeployNavigationViewMode_Update_FiltersAndCallsStudio()
{
// base case
Init(false, true);
var studio = new Mock<IStudioResourceRepository>();
PrivateObject p = new PrivateObject(_vm, new PrivateType( typeof(NavigationViewModelBase)));
p.SetField("_studioResourceRepository", studio.Object);
_vm.Update();
studio.Verify(a=>a.Load(It.IsAny<Guid>(),It.IsAny<IAsyncWorker>()));
}