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Event Handling

## onCheck Event

This event occurs when option checkbox is clicked. onCheck event passes the following parameters:

- value - option value;
- state - checkbox state (true/false);

              combo.attachEvent("onCheck", function(value,state){});

This event returns: true - confirms changing checkbox state; false - denies:

            combo.attachEvent("onCheck",function(value,state){
                if (value==2) return false;
                return true;
            })

Of course, it is possible to use any other kind of check here that will return true to allow changing state and false to deny it.