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is there any plan to cover how to make a city map (hower-clickable map)? cheers 

There are a number of other resources available that detail how to create a GUI using Imagemaps, though it should be noted that Imagemaps are a depreciated method of creating screens for general use.

https://lemmasoft.renai.us/forums/viewtopic.php?f=51&t=46229#p467929