/// <summary>
        /// コンストラクタ
        /// </summary>
        /// <param name="timelineModel">TimelineModel</param>
        /// <param name="tab">タブ</param>
        public SearchTimelineTabProperties(TimelineModel timelineModel, SearchTimelineTab tab)
        {
            this.TimelineModel = timelineModel;
            this.Tab           = tab;

            this.TopCommand       = new RelayCommand(this.Top);
            this.LatestCommand    = new RelayCommand(this.Latest);
            this.StreamingCommand = new RelayCommand(this.Streaming);
        }
 /// <summary>
 /// コンストラクタ
 /// </summary>
 /// <param name="timelineModel">TimelineModel</param>
 /// <param name="tab">タブ</param>
 public TimelineItemProperties(TimelineModel timelineModel, SearchTimelineTab tab)
 {
     this.TimelineItemType            = TimelineItemType.SearchTimelineTab;
     this.SearchTimelineTabProperties = new SearchTimelineTabProperties(timelineModel, tab);
 }