[jQuery] [validation] Validating a form with a radio and checkbox buttons - strange behavior

[jQuery] [validation] Validating a form with a radio and checkbox buttons - strange behavior


Hi!
One of test from demos named "Validating a form with a radio and
checkbox buttons" behave strange from my point of view.
Checkboxes group
Spam
Spam via E-Mail
Spam via Phone
Spam via Mail
show error message "Please select at least two types of spam.", if
none or only one of checkboxes was checked before submit. This is
correct. But this message disappear then I uncheck something. Looks
like a bug.
Serge