code: function() {
        if (this.__qooxdooVersion) {
          return this.__qooxdooVersion;
        }
        if (!this.__qooxdooVersion) {
           let lib = this.findLibrary("qx");
           if (lib) {
            this.__qooxdooVersion = lib.getVersion();  
           }
        }  
        return this.__qooxdooVersion;
      }
docs: Returns the version of Qooxdoo
  @returns {String}