The unfocusable property makes the radio button unfocusable. You may follow these steps in the example to get familiar with:
1. Open the demo and click somewhere around the radio buttons, but not over them.
2. Press the tab button to change the focus. You can see that the second radio button is focused because the first one is unfocusable.
3. Now remove the unfocusable attribute from the radio button and repeat the steps from above. This time the first radio button is focused.
Smart UI Team