Refactoring_to_improve_maintainability_and_blendability_using_IoC_part_1_02.cs

public TViewModel ViewModel
{
    get
    {
        TViewModel viewModel;
        bool designMode = DetectDesignMode();

        if (designMode)
        {
            // At design time instantiate design time version.
            // This populates mock data, dependencies don't have to be real.
            viewModel = new TDesignViewModel();
        }
        else
        {
            // Request IoC container to resolve view model & its deps.
            viewModel =
                ApplicationHost.Current.Container.Resolve<TViewModel>();
        }

        viewModel.OnLocated(wasCreated);
        return viewModel;
    }
}