code: protected final VerticalLayout createPanelContent() {
  		final VerticalLayout panelContent = new VerticalLayout();
  		panelContent.setMargin(true);
  		panelContent.setWidth(100, Unit.PERCENTAGE);
  		panelContent.setHeight(100, Unit.PERCENTAGE);
  		panelContent.setStyleName("Header");
  		return panelContent;
  	}
docs: Creates the panel content.
  
  @return the vertical layout