The Show Group Levels menu provides commands for expanding/collapsing group levels in the grid.
Collapse all rows
Collapses all groups in the grid.
This part of the menu will contain one menu item for each column heading in the grouping panel. Clicking any of these menu items will expand or collapse the grid, as necessary, to show detail down to that grouping level.
Example: Clicking Class1 in this example menu would expand all groups from Account1 through Class1, and collapse the groups Class2 and Class3.
Expand all rows
Expands all groups in the grid.
Collapse selected rows
Collapses only those group rows that are currently selected.
Expand selected rows
Expands only those group rows that are currently selected.