Try to convert the ui files to Qt 4 .ui files. As far as I can see, it's impossible to create a QButtonGroup in designer (so you can easily obtain the index of the selecte
d radio button without having to subclass or manually add the buttons to a button group, where the list of radio buttons in the ui file and in the code needs to be manuall
y kept in sync and is thus quite error-prone).

So, I'll simply leave the Q3ButtonGroup widgets in there until we find a nice way to achieve the same with Qt4.