public void initialize()
        {
            RAMRepository.RAMRepository.SharedInstance.Expenses.Clear();
            // Create categories manually
            CategoryRepository categoryRepository = new CategoryRepository();
            categoryRepository.Add(gasCategory);
            categoryRepository.Add(foodCategory);
            categoryRepository.Add(gymCategory);

            // Create expenses manually
            ExpenseRepository expenseRepository = new ExpenseRepository();
            gas0.ExpenseId = expenseRepository.Add(gas0);
            gas1.ExpenseId = expenseRepository.Add(gas1);
            food0.ExpenseId = expenseRepository.Add(food0);
            food0.ExpenseId = expenseRepository.Add(food1);
            gym0.ExpenseId = expenseRepository.Add(gym0);
            gym1.ExpenseId = expenseRepository.Add(gym1);
        }