code: @SuppressWarnings("unchecked")
  		@Override
  	    public void fillContextMenu(IMenuManager menu) {
  	        IStructuredSelection selection = (IStructuredSelection) getContext().getSelection();
  	        boolean hasClosedProjects = false;
  	        Iterator<Object> resources = selection.iterator();
  
  	        while (resources.hasNext() && (!hasClosedProjects)) {
  	            Object next = resources.next();
  	            IProject project = null;
  
  	            if (next instanceof IProject) {
  	                project = (IProject) next;
  	            } else if (next instanceof IAdaptable) {
  	                project = (IProject) ((IAdaptable) next).getAdapter(IProject.class);
  	            }
  
  	            if (project == null) {
  	                continue;
  	            }
  
  	            if (!project.isOpen()) {
  	                hasClosedProjects = true;
  	            }
  	        }
  
  	        if (!hasClosedProjects) {
  	            refreshAction.selectionChanged(selection);
  	            menu.appendToGroup(ICommonMenuConstants.GROUP_BUILD, refreshAction);
  	        }
  	    }
docs: Adds the refresh resource actions to the context menu.
  
  @param menu
  context menu to add actions to