ros-visualization/rqt_robot_plugins — pull request #46 by bit-pirate (2013-08-22 01:18:50+00:00)
Title: rewrites BatterDashWidget to fix #42

I took a quick look around, which simple Qt class supports both visualising an image (pixmap) and allows setting tool tips. What I found was the QLabel. This new version is now independent from the QToolButton.