I purchased this tilekit,but I get difficulty for two thing 1st is if we can add multiple png file to single map and 2nd is if we mearge two png that time new png file not load into the map.
Tilekit only supports a single tileset file for a map, if you want to use more than one you'll have to combine them manually into a single image. To reload the currently tileset image the Ctrl+L keyboard shortcut can be used.