/// <summary>
        /// コンストラクタ
        /// </summary>
        /// <param name="timelineModel">TimelineModel</param>
        /// <param name="tab">タブ</param>
        public UserTimelineTabProperties(TimelineModel timelineModel, UserTimelineTab tab = UserTimelineTab.Tweets)
        {
            this.TimelineModel = timelineModel;
            this._Tab          = tab;

            this.TweetsTabButtonCommand           = new RelayCommand(this.TweetsTabButton);
            this.TweetsAndRepliesTabButtonCommand = new RelayCommand(this.TweetsAndRepliesTabButton);
            this.MediaTabButtonCommand            = new RelayCommand(this.MediaTabButton);
            this.FavoritesTabButtonCommand        = new RelayCommand(this.FavoritesTabButton);
        }
 /// <summary>
 /// コンストラクタ
 /// </summary>
 /// <param name="timelineModel">TimelineModel</param>
 /// <param name="tab">タブ</param>
 public TimelineItemProperties(TimelineModel timelineModel, UserTimelineTab tab)
 {
     this.TimelineItemType          = TimelineItemType.UserTimelineTab;
     this.UserTimelineTabProperties = new UserTimelineTabProperties(timelineModel, tab);
 }