java - Validate non or max. 1 checkbox is enabled in wicket listview -

how can validate not more 1 checkbox selected in listview (repeater)?

i have form listview in wicket following structure:

line 1 n: ajaxcheckbox , textfield

both elements connected compoundpropertymodel<simpletype>. pojo simpletype looks like:

public class simpletype {    private boolean enabled;    private string value;     getter/setter... } 

if more 1 checkbox selected, form should reject changes. user must deselect selected checkbox first before can choose checkbox. tried surrounded checkgroup ivalidator<collection<simpletype>>, need change ajaxcheckbox component check. in case check seems not updated state enabled compoundpropertymodel.

do need validator or visitor case? how implement them?

since radio not option here simple solution should work:

for validation use iformvalidator visits ajaxcheckbox-es.

for immediate ui response i'd use plain js unchecks previous checked checkbox. fire wicket ajax call unselect @ server side too. once complete form submitted iformvalidator work.