private void disableVoiceActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_disableVoiceActionPerformed
        // TODO add your handling code here:
        String dest = myList.getSelectedValue().toString();
        dest = dest.trim();
        if ( dest.equals( client.frame.getTitle() ) )
        {
            JOptionPane.showMessageDialog(null, "沒事不要和自己斷線",  
                            "Error", JOptionPane.ERROR_MESSAGE);
        }
        else if ( client.player == null || !client.player.equals(dest) )
        {
             JOptionPane.showMessageDialog(null, "你沒有和這個人連線",  
                            "Error", JOptionPane.ERROR_MESSAGE);
        }
        else
        {
            client.sendMessage( "DISABLEVOICE@" + dest + "@" + client.frame.getTitle() );
        }
    }//GEN-LAST:event_disableVoiceActionPerformed