https://download.eclipse.org/nattable/releases/2.4.0/apidocs/org/eclipse/nebula/widgets/nattable/group/action/ColumnGroupExpandCollapseAction.html
ColumnGroupExpandCollapseAction (Nebula NatTable 2.4.0-SNAPSHOT API)
declaration: package: org.eclipse.nebula.widgets.nattable.group.action, class: ColumnGroupExpandCollapseAction
nebulanattablesnapshotapi