/**
   * Adds resources for contact.
   *
   * @param tip the tool tip
   * @param protocolContact the protocol contact, which resources we're looking for
   */
  private void addContactResourceTooltipLines(ExtendedTooltip tip, Contact protocolContact) {
    Collection<ContactResource> contactResources = protocolContact.getResources();

    if (contactResources == null) return;

    Iterator<ContactResource> resourcesIter = contactResources.iterator();

    while (resourcesIter.hasNext()) {
      ContactResource contactResource = resourcesIter.next();

      // We only add the status icon if we have more than one resources,
      // otherwise it will always be identical to the contact status icon.
      ImageIcon protocolStatusIcon = null;
      if (contactResources.size() > 1) {
        protocolStatusIcon =
            ImageLoader.getIndexedProtocolIcon(
                ImageUtils.getBytesInImage(contactResource.getPresenceStatus().getStatusIcon()),
                protocolContact.getProtocolProvider());
      }

      String resourceName =
          (contactResource.getPriority() >= 0)
              ? contactResource.getResourceName() + " (" + contactResource.getPriority() + ")"
              : contactResource.getResourceName();

      if (protocolStatusIcon == null) tip.addSubLine(protocolStatusIcon, resourceName, 27);
      else tip.addSubLine(protocolStatusIcon, resourceName, 20);
    }

    tip.revalidate();
    tip.repaint();
  }
  /**
   * Initializes custom contact action buttons.
   *
   * @param contactActionButtons the list of buttons to initialize
   * @param gridX the X grid of the first button
   * @param xBounds the x bounds of the first button
   * @return the new grid X coordinate after adding all the buttons
   */
  private int initGroupActionButtons(
      Collection<SIPCommButton> contactActionButtons, int gridX, int xBounds) {
    // Reinit the labels to take the whole horizontal space.
    addLabels(gridX + contactActionButtons.size());

    Iterator<SIPCommButton> actionsIter = contactActionButtons.iterator();
    while (actionsIter.hasNext()) {
      final SIPCommButton actionButton = actionsIter.next();

      // We need to explicitly remove the buttons from the tooltip manager,
      // because we're going to manager the tooltip ourselves in the
      // DefaultTreeContactList class. We need to do this in order to have
      // a different tooltip for every button and for non button area.
      ToolTipManager.sharedInstance().unregisterComponent(actionButton);

      if (customActionButtonsUIGroup == null)
        customActionButtonsUIGroup = new LinkedList<JButton>();

      customActionButtonsUIGroup.add(actionButton);

      xBounds += addButton(actionButton, ++gridX, xBounds, false);
    }

    return gridX;
  }