Because of the way CS is coded, several features (like that one) don't work. However, you can switch to classic (not restart, just open the other CS in classic environment) and build a map preview there. For doors (if you mean a door to a house) you can have a solid roof that when you step into the door, a new semi-transparent roof is layed over the house and the old roof is removed. Then you can be inside the house. In most cases though, it is best to just teleport, unless, like with most houses, it is really small.
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CI-I@()s
(url="http://"http://www.evula.org/world-of-cha0s/")The Homepage of Cha0s(/url)