By default, the AllowGroupBy property is False. Set the  AllowGroupBy property on True, to allow the user to group the items by dragging the column's header to control's sort bar. The SortBarVisible property specifies whether the control's sort bar is visible or hidden. If the control's sort bar is visible, the user can drag and drop columns to it, so the column get sorted and items grouped. The AddGroupItem event is fired when a new grouping items is added to the control's list. You can use the AddGroupItem event, to add headers or footers during grouping, customize the aggregate formula to be displayed on different columns, while dropping a column to the sortbar. The Column.AllowGroupBy property may be used to prevent grouping a specific column. The AllowSort property indicates whether the user can sort a column by clicking the column's header. The IsGrouping property specifies whether the control is grouping/ungrouping items. During grouping, the control keeps the items indentation, in other  words, a child item will be a child after or before grouping. The LayoutChanged event is fired when the user changes the layout of the control, including dragging a column to the sort bar. The SortBarColumnsCount property indicates the number of the columns being grouped. The SortBarColumn property indicates the column being sorted giving its position in the sort bar. The Group/Ungroup method groups or ungroup the control's list. For instance, you can remove the grouping items, by calling the Ungroup method. The GroupByFormatCell property determines the format of the cell to be displayed in the grouping item, when the column gets sorted.

The following movies show how Group-By works: 

• Group By support - the user can drag and drop one or more columns to the sort bar or group-by bar so the columns get sorted and grouped accordingly.

• Keep Indent - You can keep the indentation of the sub-items/children, once the user groups the rows.

• Header/Footer - Headers and footers support, to display aggregate functions like sum, min, max, and so on.

• CRD support - Can be combined with the exCRD, so you can have the rows being arranged the way you want. 

In case you need more than a Group-By feature, you should check the Exontrol's eXPivot. The Exontrol's eXPivot tool is our approach to provide data summarization, as a pivot table. A pivot-table can automatically sort, count, total or give the average of the data stored in one table or spreadsheet. The user sets up and changes the summary's structure by dragging and dropping fields graphically. The eXPivot component lets the user changes its visual appearance using skins, each one providing an additional visual experience that enhances viewing pleasure. Skins are relatively easy to build and put on any part of the control.

The following screen shot shows the control after grouping:

The following screen shot shows the control before grouping:

The AllowGroupBy property/feature has no effect if:

• SingleSort property is True.