TreeExpanderButton
TreeExpanderButton(
options?):Panel
Defined in: panel/Buttons.ts:27
GoJS-compatible: a small square button (“−” when expanded, “+” when
collapsed) that toggles the containing node’s tree — its descendants per
findTreeChildrenNodes() — via Diagram.collapseTree/expandTree. Add it
to a node template near where a link to its tree children attaches.
This is distinct from a Group’s isSubGraphExpanded/collapseGroup: it
works on any Node with tree-structured children, group or not.