addClass()
cells.all()
cells.forRange()
cells.totalDuration()
children()
collapse()
column()
edit()
events.all()
events.forRange()
events.isEmpty()
events.totalDuration()
expand()
groups.all()
groups.collapseAll()
groups.collapsed()
groups.expandAll()
groups.expanded()
parent()
remove()
removeClass()
splitChildren()
splitParent()
toggle()