/** Invoked when the composite is expanded (due to user clicking on the box). */
 protected void onExpand() {
   message.setText("");
 }
  /**
   * Builds the UI.
   *
   * @param inScope the scope.
   */
  private void setupWidgets(final StreamScope inScope) {
    this.getElement().setAttribute("id", "post-to-stream");
    this.addStyleName(StaticResourceBundle.INSTANCE.coreCss().small());

    charsRemaining = new Label();
    postButton = new Hyperlink("", History.getToken());
    postButton.getElement().setAttribute("tabindex", "2");
    message = new PostToStreamTextboxPanel();
    message.setText(postBoxDefaultText);
    message.setVisible(false); // Hide until post ready event.

    this.addStyleName(StaticResourceBundle.INSTANCE.coreCss().postToStream());
    errorMsg.addStyleName(StaticResourceBundle.INSTANCE.coreCss().formErrorBox());
    errorMsg.setVisible(false);
    this.add(errorMsg);

    FlowPanel postInfoContainer = new FlowPanel();
    postInfoContainer.addStyleName(StaticResourceBundle.INSTANCE.coreCss().postInfoContainer());

    postButton.addStyleName(StaticResourceBundle.INSTANCE.coreCss().postButton());
    postInfoContainer.add(postButton);

    charsRemaining.addStyleName(StaticResourceBundle.INSTANCE.coreCss().charactersRemaining());
    postInfoContainer.add(charsRemaining);

    AvatarWidget avatar =
        new AvatarWidget(
            Session.getInstance().getCurrentPerson(), EntityType.PERSON, Size.VerySmall);
    avatar.addStyleName(StaticResourceBundle.INSTANCE.coreCss().postEntryAvatar());

    Panel entryPanel = new FlowPanel();
    entryPanel.addStyleName(StaticResourceBundle.INSTANCE.coreCss().postEntryPanel());
    entryPanel.add(avatar);
    entryPanel.add(postInfoContainer);
    entryPanel.add(message);
    SimplePanel breakPanel = new SimplePanel();
    breakPanel.addStyleName(StaticResourceBundle.INSTANCE.coreCss().breakClass());
    entryPanel.add(breakPanel);
    add(entryPanel);

    // below text area: links and post to on one line, then content warning below

    expandedPanel.addStyleName(StaticResourceBundle.INSTANCE.coreCss().postExpandedPanel());

    postToPanel = new PostToPanel(inScope);
    expandedPanel.add(postToPanel);
    links = new AddLinkComposite();
    expandedPanel.add(links);

    contentWarning = new FlowPanel();
    contentWarningContainer.addStyleName(StaticResourceBundle.INSTANCE.coreCss().contentWarning());
    contentWarningContainer.add(new SimplePanel());
    contentWarningContainer.add(contentWarning);
    expandedPanel.add(contentWarningContainer);

    add(expandedPanel);

    setVisible(false);

    setVisible(Session.getInstance().getCurrentPerson() != null);
  }