1949 		removeChild: function (childNode) {  argument
1950 			return this.tree._callHook("nodeRemoveChild", this, childNode);
2455 		triggerModifyChild: function (operation, childNode, extra) {  argument
2460 				if (childNode && childNode.parent !== this) {
2462 						"childNode " + childNode + " is not a child of " + this
2469 					childNode: childNode || null,  property
4646 			nodeRemoveChild: function (ctx, childNode) {  argument
4650 					subCtx = $.extend({}, ctx, { node: childNode }),
4656 					_assert(childNode === children[0], "invalid single child");
4661 					(childNode === this.activeNode ||
4662 						this.activeNode.isDescendantOf(childNode))
4668 					(childNode === this.focusNode ||
4669 						this.focusNode.isDescendantOf(childNode))
4676 				idx = $.inArray(childNode, children);
4679 				node.triggerModifyChild("remove", childNode);
4681 				childNode.visit(function (n) {
4684 				this._callHook("treeRegisterNode", this, false, childNode);