public AssignmentHistoryPage ()
        {
            this.InitializeComponent ();

            DataContext =
                assignmentViewModel = ServiceContainer.Resolve<AssignmentViewModel> ();
            
            historyListView.DataContext =
                historyViewModel = ServiceContainer.Resolve<HistoryViewModel> ();
        }
        public AssignmentPage ()
        {
            this.InitializeComponent ();

            DataContext =
                assignmentControl.DataContext =
                assignmentViewModel = ServiceContainer.Resolve<AssignmentViewModel> ();
            
            itemViewModel = ServiceContainer.Resolve<ItemViewModel> ();
            
            laborViewModel = ServiceContainer.Resolve<LaborViewModel> ();
            
            photoViewModel = ServiceContainer.Resolve<PhotoViewModel> ();
            
            expenseViewModel = ServiceContainer.Resolve<ExpenseViewModel> ();
            
            documentViewModel = ServiceContainer.Resolve<DocumentViewModel> ();
            
            historyViewModel = ServiceContainer.Resolve<HistoryViewModel> ();

            picker = new MediaPicker ();
        }