code: public CmsListDefaultAction removeDefaultAction(String actionId) {
  
          Iterator<CmsListDefaultAction> it = m_defaultActions.iterator();
          while (it.hasNext()) {
              CmsListDefaultAction action = it.next();
              if (action.getId().equals(actionId)) {
                  it.remove();
                  return action;
              }
          }
          return null;
      }
docs: Removes the default action from this column by id.<p>
  
  @param actionId the id of the action to remove
  
  @return the action if found or <code>null</code>