When a radiobutton takes the focus, the first button is focused and not the selected one.
This behaviour creates a lot of confusion because one button, the first, is highlighted because of the focus and the selected is hilighted because of the selection.
Tks but I explained my problem in un unclear mode, may be.
In my idea a radio butto group is an single element composed of 4 buttons (in your example).
When I set the focus, I want to set the focus on that element (4 buttons) and the highlighted button should be the selected one in order to avoid having more than one buton emphasized.