public TweetColumn(AccessToken accessToken, ColumnRoles columnRole)
 {
     this.accessToken = accessToken;
     this.columnRole  = columnRole;
     tweetList        = new ObservableCollection <AdvancedTweet>();
     columnTitle      = columnRole.ToString();
 }
 public TweetColumn(AccessToken accessToken, string userScreenName)
 {
     this.accessToken    = accessToken;
     columnRole          = ColumnRoles.UserTimeLine;
     tweetList           = new ObservableCollection <AdvancedTweet>();
     columnTitle         = "Tweets of @" + userScreenName;
     this.userScreenName = userScreenName;
 }