public SelectColumnDialog(bool showCheckBoxes, ColumnSchemaCollection columns)
        {
            this.Build();

            selecter = new SelectColumnWidget(showCheckBoxes);
            selecter.Initialize(columns);
            selecter.ColumnToggled += new EventHandler(OnColumnToggled);

            hboxContent.PackStart(selecter, true, true, 0);

            ShowAll();
        }
		public SelectColumnDialog (bool showCheckBoxes, ColumnSchemaCollection columns)
		{
			this.Build();
			
			selecter = new SelectColumnWidget (showCheckBoxes);
			selecter.Initialize (columns);
			selecter.ColumnToggled += new EventHandler (OnColumnToggled);
			
			hboxContent.PackStart (selecter, true, true, 0);
			
			ShowAll ();
		}