Bogue.RadiolistSourceCheck list with a single choice
Each item of the list is displayed with a 'radio button' in front of it, and at most one item can be selected, similarly to <input type="radio"...> in html. Radiobuttons are implemented with Check.t.
A radiolist with the usual vertical layout of items. The option click_on_label is true be default: one can click on the label to select it.
Set the selected entry to the specified index and directly activate the button's connections with the Trigger.var_changed event.