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
aMenu.setVisible(true);
	}
	/* (non-Javadoc)
	 * @see org.eclipse.ui.internal.skins.Presentation#getControl()
	 */
	public Control getControl() {
		return paneFolder.getControl();
	}
    /*
     * (non-Javadoc)
     * 
     * @see org.eclipse.ui.internal.skins.StackPresentation#dragOver(org.eclipse.swt.widgets.Control,
     *      org.eclipse.swt.graphics.Point)
     */
    public StackDropResult dragOver(Control currentControl, Point location) {
        
        Point localPos = paneFolder.getControl().toControl(location);
        final CTabItem tabUnderPointer = paneFolder.getItem(localPos);
        
        
        if (tabUnderPointer == null) return null;
        
        int dragOverIndex = paneFolder.indexOf(tabUnderPointer);
        return new StackDropResult(Geometry.toDisplay(paneFolder.getControl(),
                tabUnderPointer.getBounds()), new Integer(dragOverIndex));
    }
		
	/**
	 * Returns the toolbar control for the currently selected part, or null if none (not 
	 * all parts have a toolbar).