to find out how to create my own section, I put an empty submap in the dms sections map. Although empty, the name of this map was shown in the 'add-to-page' section list. I removed the map and created a new map with a section.php file as described in http://docs.pagelines.com/developer/section-api, but it did not show up in the list of section in DMS2. I removed the section.php file, not the submap, but still no new section was shown in the list.
What do I do wrong?