ComCtrls

Use TWorkAreas to represent the work areas of a list view control. Each work area is represented by a single TWorkArea object. Most importantly, these work areas define rectangles that cover portions of the list view's client area. List items are associated with a work area when they are placed in the portion of the client area covered by a work area's rectangle. These associations are used to add an extra level of organization to the list view, with list items arranged within each work area. 

TWorkArea 

TCustomListView