3410 		removeChild: function (childNode) {  argument
3411 			return this.tree._callHook("nodeRemoveChild", this, childNode);
3916 		triggerModifyChild: function (operation, childNode, extra) {  argument
3921 				if (childNode && childNode.parent !== this) {
3923 						"childNode " + childNode + " is not a child of " + this
3930 					childNode: childNode || null,  property
6107 			nodeRemoveChild: function (ctx, childNode) {  argument
6111 					subCtx = $.extend({}, ctx, { node: childNode }),
6117 					_assert(childNode === children[0], "invalid single child");
6122 					(childNode === this.activeNode ||
6123 						this.activeNode.isDescendantOf(childNode))
6129 					(childNode === this.focusNode ||
6130 						this.focusNode.isDescendantOf(childNode))
6137 				idx = $.inArray(childNode, children);
6140 				node.triggerModifyChild("remove", childNode);
6142 				childNode.visit(function (n) {
6145 				this._callHook("treeRegisterNode", this, false, childNode);