Invalid cast on chained calls

I have a chain of property and indexer calls that includes a cast. I get an InvalidCastException on the cast, even though the code that I'm trying to test actually works.

It happened when I started using a BindingListView library to bind a List<> of Project objects to a DataGridView. Here's the code in my Presenter class that does the binding:

        public void LoadData()
        {
            List<Project> projectsList = _scope.Extent<Project>().ToList();
            _view.GridDataSource = new BindingListView<Project>( projectsList );
        }

Then I use the following code to see which Project the user has selected in the grid:

        public void SelectionChanged()
        {
            if ( _view.GridSelectedRows.Count == 1 )
            {
                SelectedProject = 
                    ( ( Equin.ApplicationFramework.ObjectView<Project> )
                    (_view.GridSelectedRows[0].DataBoundItem )).Object;
                _view.EditButtonEnabled = true;
                _view.DeleteButtonEnabled = true;
            }
        }

This code works when I run it. But I have problems when I try to test the code that loads SelectedProject using the following test:

        /// <summary>
        /// If the SelectionChanged() method is called when a Project is selected on the 
        /// form's ProjectsGrid, check that the SelectedProject is set to that Project
        /// </summary>
        [Test]
        public void SelectionChangedToProject_SetsSelectedProject()
        {
            InstantiateProjects();                  // Creates List<Project> _project
            Isolate.WhenCalled( () => _viewFake.GridSelectedRows.Count ).
                WillReturn( 1 );
            Isolate.WhenCalled( () => 
                ( ( Equin.ApplicationFramework.ObjectView<Project> )
                ( _viewFake.GridSelectedRows[0].DataBoundItem ) ).Object ).
                WillReturn( _projects[2] );

            _presenter.SelectionChanged();

            Isolate.Verify.WasCalledWithAnyArguments( () =>
                ( ( Equin.ApplicationFramework.ObjectView<Project> )
                ( _viewFake.GridSelectedRows[0].DataBoundItem ) ).Object );
            Assert.AreSame( _projects[2], _presenter.SelectedProject );
        }

It fails at Isolate.Verify with the message 'Unable to cast object of type 'System.Object' to type 'Equin.ApplicationFramework.ObjectView`1[Integrator.Management.Project]'.
I thought it may be due to the chain of properties and indexes. So I tried faking each part of the chain, but it always fails when it gets to the cast.