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
systemMenuManager.add(new UpdatingActionContributionItem(new SystemMenuMinimize(getSite())));
		
		systemMenuManager.add(new UpdatingActionContributionItem(new SystemMenuMaximize(getSite())));
		systemMenuManager.add(new Separator("close")); $NON-NLS-1$
		systemMenuManager.add(new UpdatingActionContributionItem(new SystemMenuClose(getSite())));
		
		getSite().addSystemActions(systemMenuManager);
	}
	protected String getPaneName() {
		return R21PresentationMessages.getString("BasicStackPresentation.pane"); $NON-NLS-1$
	}
	/**
	 * Displays the view menu as a popup
	 */
	public void showPaneMenu() {
		IPartMenu menu = getPartMenu();
		
		if (menu != null) {
			Rectangle bounds = DragUtil.getDisplayBounds(viewToolBar);
			menu.showMenu(new Point(bounds.x, bounds.y + bounds.height));
		}
	}
	/**
	 * Returns the currently selected part, or <code>null</code>.
	 * 
	 * @return the currently selected part, or <code>null</code>
	 */
	protected IPresentablePart getCurrent() {
	    return current;
	}