Three UI elements needed:
1) Pie chart, including legend. Individual slices can be selected (by touching) to bring up more details.
2) Panel that has 6 buttons, dark background, semi-transparent, with rounded corners
3) Panel of multiple buttons (i.e. 3 buttons) that works like radio buttons (only one can be selected at a time)
I can send you detailed pictures of what is needed, just ask me.