public class TutorialToolBehaviorProvider extends DefaultToolBehaviorProvider {
 ...
  @Override
  public IDecorator[] getDecorators(PictogramElement pe) {
    IFeatureProvider featureProvider = getFeatureProvider();
    Object bo = featureProvider.getBusinessObjectForPictogramElement(pe);
    if (bo instanceof EClass) {
        IDecorator imageRenderingDecorator1 = new ImageDecorator(IPlatformImageConstants.IMG_ECLIPSE_ERROR);
        imageRenderingDecorator1.setMessage("Error");
        IDecorator imageRenderingDecorator2 = new ImageDecorator(IPlatformImageConstants.IMG_ECLIPSE_INFORMATION);
        imageRenderingDecorator2.setMessage("Info"); 
        return new IDecorator[] { imageRenderingDecorator1,imageRenderingDecorator2};
    }
    return super.getDecorators(pe);
  }