Set all expansion symbols to the same triangle symbols.
Unified the behavior of expansion animation.
Added tooltips and alter text to the expansion symbols.
Changed the condition recordType=='Science Theme Collection' to theme == scienceTheme so it won't rely on theme label (otherwise any change to the label will cost app to fail).
http://mml.nist.gov:8080/browse/ODD-1066
This check in has following changes: