Sadly, the map editor doesn't pick up its resources (graphics, values, data) from the same files & folders as when a random game (sandbox mode) is started or played.
This is one "flaw" which i also wish SD coders could find a solution for... since custom maps lose all of their true meanings (think creation of campaign stuff here too!) if a mod folder actually HAS a number of specific elements loaded with its own CustomPlanets.xml file.
Weird situation. Hopefully, someone will fix or tweak this issue -- eventually, maybe. But, it has been asked for months without any luck.
