/additional_action
display the images of this layout

Sourcecode in LayoutImageMgr/actions.js:
1:   function additional_action() {
2:      res.data.imagelist = renderList(this, "mgrlistitem", 10, req.data.page);
3:      res.data.pagenavigation = renderPageNavigation(this, this.href(req.action), 10, req.data.page);
4:      res.data.title = getMessage("LayoutMgr.listImagesTitle", {parentLayoutTitle: this._parent.title});
5:      res.data.body = this.renderSkinAsString("main");
6:      res.handlers.context.renderSkin("page");
7:      return;
8:   }