func = val,
						args = Array.prototype.slice.call(arguments),
						evnt = new $.Event("before.jstree"),
						rlbk = false;

					if(this.data.core.locked === true && i !== "unlock" && i !== "is_locked") { return; }

					// Check if function belongs to the included plugins of this instance
					do {
						if(func && func.plugin && $.inArray(func.plugin, this._get_settings().plugins) !== -1) { break; }