Start a new project
add two option buttons
go to tab order
Select the option group listed in the tab order. The last option button added will be selected
Now select the other option button that was added. Note that it does not select the group that it belongs to in the tab order. Even though it has a tab, you can't tell as it doesn't appear in the tab order.
Also note: the tab order area displays the text of one of the buttons. It looks like the others aren't there. I am not sure but I think all buttons belonging to a group belong to the same tab order.
Anyway, a little confusing because you can't tell all the option buttons are in the tab order.
Option buttons have an Index property. The Group has the Tab Order. Usually you Tab into the group and use Arrow keys to select the option.
Right you are, it doesn't appear that clicking on the different option buttons in the same "GroupName" will highlight the entry in the Tab Order list. I'll have to fix that.
Good catch.
This is now fixed and will be in the 3.08 update.