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
paneFolder.layout(true);
		if (current != null) {
			Rectangle clientArea = paneFolder.getClientArea();
			Rectangle bounds = paneFolder.getControl().getBounds();
			clientArea.x += bounds.x;
			clientArea.y += bounds.y;
			
			current.setBounds(clientArea);
		}
	}
	
	/**
	 * Returns the IPartMenu for the currently selected part, or null if the current
	 * part does not have a menu.
	 * 
	 * @return the IPartMenu for the currently selected part or null if none
	 */
	protected IPartMenu getPartMenu() {
		IPresentablePart part = getCurrentPart();		
		if (part == null) {
			return null;
		}
		return part.getMenu();
	}
		
	/* (non-Javadoc)
	 * @see org.eclipse.ui.internal.skins.Presentation#dispose()
	 */
	public void dispose() {
		if (isDisposed()) {