Class selection issue. When a user decides to edit a style/label or variable and
does not move the the class selection blue highlighter by selecting the radio
button. The user can still edit the unselected class. 

Options:
1) Either the unselected classes are greyed out. Making the user to select the
class.

2) The Blue Highlight and radio dot moves automatically to the class the user is
working on. 

Option 2: is already relfected in the interface. For example when a new class is
added, the new class becomes selected.

Option 1: Gives more control to the interface and maybe less issues/bugs in the
future for developers. This maybe the better option??