code: function _handleCommandRegistered(event, command) {
          var commandId   = command.getID(),
              defaults    = KeyboardPrefs[commandId];
  
          if (defaults) {
              addBinding(commandId, defaults);
          }
      }
docs: Adds default key bindings when commands are registered to CommandManager
  @param {$.Event} event jQuery event
  @param {Command} command Newly registered command