fires when the user clicks any radio item
| group | string | name of the radio group | 
| idChecked | string|number | id of the checked radio item | 
| idClicked | string|number | id of the clicked radio item | 
| zoneId | string | id of the context menu zone, if a menu rendered in the context menu mode | 
| cas | object | state of CTRL/ALT/SHIFT keys during the click (pressed/not pressed) | 
myMenu.attachEvent("onRadioClick", function(group, idChecked, idClicked, zoneId, cas){
    // your code here
    // ...
 
    // cas example
    if (cas.ctrl == true) {
        // open in a new tab
    } else {
        // open on the same page
    }
 
    // allow radio button to be checked
    return true;
});
The cas object has the following structure (true if a key was pressed during the click):
{
    ctrl:   true|false,
    alt:    true|false,
    shift:  true|false
}
The event is cancellable, to allow checkbox to be checked you need to "return true".
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