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/r21/widgets/R21PaneFolder.java
/**
	 * Sets the top-left control (usually a title label), or null if none
	 * 
	 * @param topLeft
	 */
	public void setTopLeft(Control topLeft) {
		if (topLeftCache.getControl() != topLeft) {
			topLeftCache.setControl(topLeft);
			
			if (topLeft != null) {
				viewFormTopLeftProxy.setTarget(topLeftCache);
				viewForm.setTopLeft(viewFormTopLeftProxy.getControl());
			} else {
				viewFormTopLeftProxy.setTarget(null);
				viewForm.setTopLeft(null);
			}
		}
	}
	
	public void layout(boolean flushCache) {
		
		if (flushCache) {
			topLeftCache.flush();
			topRightCache.flush();
			topCenterCache.flush();
		}
		Rectangle tabFolderClientArea = tabFolder.getClientArea();
		
		
		if (tabFolder.getItemCount() < 2) {