[求救]关于Delphi中控件的拖放（初次使用Delphi，望高人指点）[3]

            grouping related work orders by the item category, and the expected

            starting date 

            for each item category, show the production capacity per day and

            the summed loading below the day    e.g. sum of work order qty

            for work orders with expected starting date = 2005/07/28,