Contains quick-access commands for expanding and collapsing the hierarchy.
Expand Objects: Expands branches for all descendants of the object. Expand Tracks: Expands all levels of all non-object branches below the item.
Expand All: Expands all non-object branches and descendants of the object.
Collapse Objects: Collapses all branches for descendants of the object. Collapse Tracks: Collapses all non-object branches below the item. Collapse All: Collapses all branches in the hierarchy.
Select All: Selects all tracks.
Select Invert: Inverts the current selection pattern of tracks, deselecting selected tracks, and selecting deselected tracks. Has no effect on collapsed tracks.
Select Children: All object tracks that are children of the selected track are selected.
Select None: Deselects all selected tracks.