public void ShowPatients()
    {
        lslPatients.removeAll();
        int n = ReturnedPatients.size();
        if (n <= 0)
        {
            ClearPInfo();
            String[] temp = new String[1];
            temp[0]="";
            lslPatients.setListData(temp);
            return;
        }
        String[] ps = new String[n];
        for(int i=0;i<ReturnedPatients.size();i++)
        {
            Patient p = (Patient)ReturnedPatients.get(i);
            ps[i] = PIDtoString(p.PatientID) + ": "+p.FirstName+" "+p.LastName;
        }
        lslPatients.setListData(ps);
        lslPatients.setSelectedIndex(0);
        ShowPInfo((Patient)ReturnedPatients.get(0));
        btnPCreate.setEnabled(false);
    }