code: function (name,sheet) {
          return !!(name && sheet instanceof StyleSheet &&
                    !sheets[name] && (sheets[name] = sheet));
      }
docs: Registers a StyleSheet instance in the static registry by the given name
  
  @method StyleSheet.register
  @param name {String} the name to assign the StyleSheet in the registry
  @param sheet {StyleSheet} The StyleSheet instance
  @return {Boolean} false if no name or sheet is not a StyleSheet
  instance. true otherwise.
  @static