The 1.7 version just added include two significant improvements:
— “Segmented Control”, which is an improved “Selection Buttons” with divider bars and better spacing to get a clean look (thanks to Christina Rodgers from NI). Previous version had one-pixel gaps.
— Improved buttons (motivated by the techniques discover with the Segmented Control) that maintain a rounded-rectangle boarder in their hover and ON states (the previous version lost its rounded-rectangle shape in those states). This gives a much better look on hover. Also allows the ON state to have its colour changed (also possible with the Segmented Control).
It can be a bit confusing learning how to colour these controls. One has to click on the outside boarder to colour the OFF state, and inside the boarder to colour the ON state. Coloring inside the boarder will colour the ON state even when the control is OFF, due to weirdness of the system button’s treatment of colour.