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
part.addPropertyListener(childPropertyChangeListener);
		tabItem.addDisposeListener(tabDisposeListener);
		initTab(tabItem, part);
		
		return tabItem;
	}
	
	/**
	 * Initializes a tab for the given part. Sets the text, icon, tool tip,
	 * etc. This will also be called whenever a relevant property changes
	 * in the part to reflect those changes in the tab. Subclasses may override
	 * to change the appearance of tabs for a particular part.
	 * 
	 * @param tabItem tab for the part
	 * @param part the part being displayed
	 */
	protected void initTab(CTabItem tabItem, IPresentablePart part) {
		tabItem.setText(part.getName());
		
		
		
        String toolTipText = part.getTitleToolTip();
        if (!toolTipText.equals(Util.ZERO_LENGTH_STRING)) {
        	tabItem.setToolTipText(toolTipText);
        }
		
 
		
		else{
		}