LabelToolItem is not showing the text properly on IE8, while on Mozilla woks fine

Code:
LabelToolItem labelRecord = new LabelToolItem("Scheda");
LabelToolItem labelPage = new LabelToolItem("Pagina");
...
toolBar.add(labelRecord);
...
toolBar.add(labelPage);
...
layoutContainer.add(toolBar);

toolBar.layout();
layoutContainer.layout();
IE8-LabelToolItem.pngFirefox-LabelToolItem.png