[Plugin: Contact Form 7] Radiobutton activ/inactiv

Hi all,

i use a contactform with 8 radiobutton, where users can select one or more of them. the problem is, if you have select one of this you cant deselect. you must refresh the site to have the field clean.

Is there a chance to change the form, so anyone can activat and deactivate this buttons?

thanx Roy