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
setControlSize();
		}
	};
	
	private IPropertyListener childPropertyChangeListener = new IPropertyListener() {
		public void propertyChanged(Object source, int property) {
			if (source instanceof IPresentablePart) {
				IPresentablePart part = (IPresentablePart) source;
				childPropertyChanged(part, property);
			}
		}	
	};
	
	private DisposeListener tabDisposeListener = new DisposeListener() {
		public void widgetDisposed(DisposeEvent e) {
			if (e.widget instanceof CTabItem) {
				CTabItem item = (CTabItem)e.widget;
				
				IPresentablePart part = getPartForTab(item);
				
				part.removePropertyListener(childPropertyChangeListener);
			}
		}
	};
    
    private ShellAdapter shellListener = new ShellAdapter() {
        public void shellActivated(ShellEvent event) {
            updateGradient();
        }
        public void shellDeactivated(ShellEvent event) {