/** * Gets the header part of the Panel/Border. Returns null if it doesn't have a header tag. * * @param container * @param id * @param markup * @return the header part for this panel/border or null if it doesn't have a wicket:head tag. */ private HeaderPartContainer getHeaderPart( final WebMarkupContainer container, final String id, final IMarkupFragment markup) { // Create a HtmlHeaderContainer for the header tag found final MarkupElement element = markup.get(0); if (element instanceof WicketTag) { final WicketTag wTag = (WicketTag) element; if ((wTag.isHeadTag() == true) && (wTag.getNamespace() != null)) { // Create the header container and associate the markup with it return new HeaderPartContainer(id, container, markup); } } throw new WicketRuntimeException( "Programming error: expected a WicketTag: " + markup.toString()); }