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
return;
		}
        
        paneFolder.getControl().getShell().removeShellListener(shellListener);
		PresentationUtil.removeDragListener(paneFolder.getControl(), dragListener);
		PresentationUtil.removeDragListener(titleLabel, dragListener);
		
		systemMenuManager.dispose();
		systemMenuManager.removeAll();
		paneFolder.getControl().dispose();
		paneFolder = null;
		
		titleLabel.dispose();
		titleLabel = null;
		
		viewToolBar.dispose();
	}
	
	/* (non-Javadoc)
	 * @see org.eclipse.ui.internal.skins.Presentation#setActive(boolean)
	 */
	public void setActive(boolean isActive) {
		activeState = isActive;
		updateGradient();
	}
	
    /**
     * Return whether the window's shell is activated
     */
    boolean getShellActivated() {