The PanelBar supports two different expand modes.
These modes are:
"single"—Enables you to expand only one item at a time. If you expand an item, the previously expanded item is collapsed.
"multiple"—This is the default expand mode of the PanelBar. It enables you to expand tow or more items at a time. Items can also be toggled.
To configure the expand modes, use the
expandMode property of the PanelBar.