         let reusable:UICollectionReusableView = collectionView.dequeueReusableSupplementaryView(
             ofKind: kind,
             withReuseIdentifier:
-            VProjectsHeader.reusableIdentifier(),
+            VProjectsHeader.reusableIdentifier,
             for:
             indexPath)
         

            forSupplementaryViewOfKind:
            UICollectionElementKindSectionHeader,
            withReuseIdentifier:
            VProjectsHeader.reusableIdentifier())
        collection.register(
            VProjectsCell.self,
            forCellWithReuseIdentifier:
            VProjectsCell.reusableIdentifier())
        collection.isHidden = true
        self.collection = collection
        
        addSubview(spinner)
        addSubview(collection)
        
        let views:[String:AnyObject] = [
            "spinner":spinner,
            "collection":collection]
        
        let metrics:[String:AnyObject] = [:]
        
        addConstraints(NSLayoutConstraint.constraints(
            withVisualFormat: "H:|-0-[spinner]-0-|",
            options:[],
            metrics:metrics,
            views:views))
        addConstraints(NSLayoutConstraint.constraints(
            withVisualFormat: "V:|-0-[spinner]-0-|",
            options:[],
            metrics:metrics,
            views:views))
        addConstraints(NSLayoutConstraint.constraints(
            withVisualFormat: "H:|-0-[collection]-0-|",
            options:[],
            metrics:metrics,
            views:views))
        addConstraints(NSLayoutConstraint.constraints(
            withVisualFormat: "V:|-0-[collection]-0-|",
            options:[],
            metrics:metrics,
            views:views))

    
    func collectionView(_ collectionView:UICollectionView, cellForItemAt indexPath:IndexPath) -> UICollectionViewCell
    {
        let item:MProjectsItem = modelAtIndex(index:indexPath)
        let cell:VProjectsCell = collectionView.dequeueReusableCell(
            withReuseIdentifier:VProjectsCell.reusableIdentifier,
            for:
            indexPath) as! VProjectsCell
        cell.config(item)
