Click and change events on checkbox elements which are not appended into document tree

I created fragment of html-code with a radio-group. But I didn't append this fragment into document tree because I need to configure this fragment using click event of first radio-element BEFORE I will show it to users. I use JQuery to set click handler. After it I call this handler through input.click(). Handler works but the property CHECKED in radio-element doesn't change until radio-element is not appended into document tree. Only FF behaves so - other browsers (IE, Chrome, Safari) change this property. When I appended radio-element into document tree then FF could change this property. Can You explain to me why FF behaves so, please? PS Checkbox-elements behave also PSS Attachment contains an image of example Best regards.