public async Task <bool> AddNewUserTask(UserTask userTask)
        {
            var isAdded = await StorageService.AddNewUserTaskAsync(userTask);

            if (ActiveTask.Id == userTask.Id)
            {
                ActiveTask = userTask;
            }
            if (isAdded)
            {
                UserTasks.RemoveAll(x => x.Id == userTask.Id);
                UserTasks.Insert(0, userTask);
                UserTaskModifiedEvent?.Invoke(this, new UserTaskModifiedEventArgs()
                {
                    UserTask = userTask
                });
            }
            return(isAdded);
        }