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
Rectangle clientArea = tabFolder.getClientArea();
        Point location = tabFolder.getControl().getDisplay().map(tabFolder.getControl(), null,
                clientArea.x, clientArea.y);
        showList(shell, location.x, location.y);
    }
    
	void setSelection(CTabItem tabItem) {
        getSite().selectPart(getPartForTab(tabItem));
    }
    void close(IPresentablePart presentablePart) {
        getSite().close(new IPresentablePart[]{presentablePart});
    }
    
    Image getLabelImage(IPresentablePart presentablePart) {
        return presentablePart.getTitleImage();
    }
    
    String getLabelText(IPresentablePart presentablePart,
            boolean includePath) {
        String title = presentablePart.getTitle().trim();
        return title;
    }
	/* (non-Javadoc)
	 * @see org.eclipse.ui.presentations.StackPresentation#setActive(int)
	 */
	public void setActive(int newState) {
		setActive(newState == AS_ACTIVE_FOCUS);
	}
}