Dropdown menu still bugs out, rapidly switching choice selection

[GoogleCodeExporter]

What steps will reproduce the problem?
1. Example of  http://stemkoski.github.io/Three.js/Color-Explorer.html
2. It was reported a year ago on the github: 
https://github.com/dataarts/dat.gui/issues/32

What is the expected output? What do you see instead?
Item selection should be stable.  Instead, rapidly flips back and forth between 
selections just moving the mouse slightly.  

What version of the product are you using? On what operating system?
0.51.  Windows 8.1

Please provide any additional information below.

Original issue reported on code.google.com by trave...@gmail.com on 16 Feb 2015 at 3:16

[GoogleCodeExporter]

Some new information: This happens when a control uses listen().  Without the 
listen function, there is no problem.  

Original comment by trave...@gmail.com on 16 Mar 2015 at 3:02