If the Show Outline Bar property is enabled for a C1FlexGrid control, and at least one column is checked in the Group Order list, then a numeric button bar is displayed in the column header row at runtime so the user can expand or collapse all of the grouping rows at that level.
The groups are expanded and collapsed using the arrows displayed on the left side of each column header.
In the example below, “France” is expanded and “UK” is collapsed. Click the arrows next to each to switch. If there is further grouping (in the example, the data was grouped by country, then category), those sub-categories can also be expanded or collapsed.
