protected void addTabContent(final PTabPanel tabPanel) {
    final PSimplePanel tabContent = new PSimplePanel();

    final int tabIndex = tabCount;
    final PLabel label = new PLabel("content-" + tabIndex);
    tabContent.setWidget(label);
    tabPanel.add(tabContent, "Tab-" + tabIndex);
    tabCount++;
  }
  protected void addCustomTabContent(final PTabPanel tabPanel) {
    final PSimplePanel tabContent = new PSimplePanel();

    final int tabIndex = tabCount;
    final PLabel tabLabel = new PLabel("CustomTab-" + tabIndex);
    tabLabel.setStyleProperty("color", "blue");
    tabLabel.setStyleProperty("whiteSpace", "nowrap");
    final PLabel label = new PLabel("content-" + tabIndex);
    tabContent.setWidget(label);
    tabPanel.add(tabContent, tabLabel);
    tabCount++;
  }