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
{
			viewForm = new ViewForm(tabFolder, SWT.NONE);
			
			viewFormTopLeftProxy = new ProxyControl(viewForm);
			viewFormTopCenterProxy = new ProxyControl(viewForm);
			viewFormTopRightProxy = new ProxyControl(viewForm);
			
			contentProxy = new ProxyControl(viewForm);
			viewForm.setContent(contentProxy.getControl());
		}
	}
	
	/**
	 * Return the main control for this pane folder
	 * 
	 * @return
	 */
	public Composite getControl() {
		return tabFolder;
	}
	
	/**
	 * Sets the top-center control (usually a toolbar), or null if none.
	 * Note that the control can have any parent.
	 * 
	 * @param topCenter the top-center control or null if none
	 */
	public void setTopCenter(Control topCenter) {
		topCenterCache.setControl(topCenter);
		if (topCenter != null) {