private void InitializeColumns(VwbQuery query)
{
Columns = query.ColumnKeysInOrder != null
? ColumnFactory.GetColumns(query.ColumnKeysInOrder).ToList()
: new List <IVwbColumn>();
_articleCheckboxes = ColumnFactory.GetArticleCheckboxes();
_articleNumberColumn = ColumnFactory.GetArticleNumberColumn();
_titleColumn = ColumnFactory.GetTitleColumn();
Columns.InsertRange(0, new[] { _articleCheckboxes, _articleNumberColumn, _titleColumn });
}