@Override
				public void actionPerformed(ActionContext context) {
					Object contextObject = context.getContextObject();
					GTree gTree = (GTree) contextObject;
					TreePath path = gTree.getSelectionPath();
					CallNode node = (CallNode) path.getLastPathComponent();
					goTo(node.getLocation());
				}
A variable used to restrict open-ended operations, like expanding all nodes or filtering.
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/calltree/CallTreeProvider.java