Bug 65444 [R21PRES] Close button shown when views not closeable
RC1 build - run the browser example using the R2.1 presentation - the views have close buttons in the titlebar, but should not because the perspective has fixed="true" (meaning that all initial views are non-moveable and non-closeable)
bundles/org.eclipse.ui.presentations.r21/src/org/eclipse/ui/internal/presentations/R21BasicStackPresentation.java
* @param part the part being searched for
	 * @return the tab for the given part, or null if there is no such tab
	 */
	protected final CTabItem getTab(IPresentablePart part) {
		CTabItem[] items = paneFolder.getItems();
		
		int idx = indexOf(part);
		
		if (idx < items.length) {
			return items[idx];
		}
		
		return null;
	}
	
	/**
	 * @param part
	 * @param property
	 */
	protected void childPropertyChanged(IPresentablePart part, int property) {
		
		CTabItem tab = getTab(part);
		initTab(tab, part);
		
		switch (property) {
		 case IPresentablePart.PROP_BUSY:
			break;
	     case IPresentablePart.PROP_HIGHLIGHT_IF_BACK: