src/javascript/core/utils/Basic.js
function ctor() {
			this.constructor = child;

			if (MXI_DEBUG) {
				var getCtorName = function(fn) {
					var m = fn.toString().match(/^function\s([^\(\s]+)/);
					return m ? m[1] : false;
				};

				this.ctorName = getCtorName(child);
			}
		}
function ctor() {
			this.constructor = child;

			if (MXI_DEBUG) {
				var getCtorName = function(fn) {
					var m = fn.toString().match(/^function\s([^\(\s]+)/);
					return m ? m[1] : false;
				};

				this.ctorName = getCtorName(child);
			}
		}
give child `class` a place to define its own methods