I didn't find any post about how to change the bubble markers in Nagmap. I would like to show some bubble icons placed in Nagmap to differentiate servers and switches devices monitored by Nagios. In the original configuration, only "bubbles" are showed, but I want something like this:

In this picture we can see some network devices and the "bubble" icon (in green) sharing the same space in the Nagmap. How to do this?
Thx any help...