public ToDoListViewModel(IApplication app, IDataBase db)
{
_application = app;
_db = db;
Pending = new TrulyObservableCollection <ToDoItem>();
Pending.ItemChanged += Pending_ItemChanged;
Completed = new TrulyObservableCollection <ToDoItem>();
Pending.AddRange(_db.Todo.GetUncompleted());
Completed.AddRange(_db.Todo.GetCompleteded());
AddNewItemCommand = Command.CreateCommand(AddNewItem);
DeleteItemCommand = Command.CreateCommand <int>(DeleteItem, CanDelete);
DeleteCompletedItemsCommand = Command.CreateCommand(DeleteCompletedItems);
}
