Please integrate the MeasureConfigWidget.ui file at: 

http://devel-home.kde.org/~tackat/MeasureConfigWidget.ui

with the code.

Make sure that

- The variable names fit

- Every option is loaded and saved properly

- The Polygon Area option should be hidden since it's currently not supported yet

- If Polygon is selected the Polygon tab should be active and the other one should be grayed out.

- If Circle is selected the Circle tab should be active and the other one should be grayed out.