public void Close(DialogueActer acter)
 {
     Candidates.Remove(acter);
     if (CandidateActer.Equals(acter))
     {
         CandidateActer = null;
         if (Candidates.Count() == 1)
         {
             SetCandidate(Candidates.First());
         }
         else if (Candidates.Count() > 1)
         {
             UpdateCandidate();
         }
     }
     // Disable potential canvas
 }