 		super.viewWillLayoutSubviews()
 
 		//	Layout the fixed-position header containing the search field
-		let headerFrame = CGRect(x:0, y: self.topLayoutGuide.length, width: self.view.bounds.width, height: _fixedHeaderHeight)
-		_fixedHeaderView.frame = headerFrame
-
-		let bounds = _fixedHeaderView.bounds
+		let headerFrame = CGRect(x:0, y: self.topLayoutGuide.length, width: self.view.bounds.width, height: fixedHeaderHeight)
+		fixedHeaderView.frame = headerFrame
+
+		let bounds = fixedHeaderView.bounds
 		let margin:CGFloat = 20
-		let searchFieldHeight:CGFloat = _searchField.intrinsicContentSize().height
+		let searchFieldHeight:CGFloat = searchField.intrinsicContentSize().height
 		let searchFieldFrame = CGRect(x: margin, y: bounds.midY - searchFieldHeight/2, width: bounds.width-2*margin, height: searchFieldHeight)
 
-		_searchField.frame = searchFieldFrame
+		searchField.frame = searchFieldFrame
 	}
 
 	override func didReceiveMemoryWarning() {
-		_dataSource.didReceiveMemoryWarning()
+		dataSource.didReceiveMemoryWarning()
 	}
 
 	override func preferredStatusBarStyle() -> UIStatusBarStyle {

	}

	func stopWiggling() {
		if let displayLink = _wiggleAnimationDisplayLink {
			displayLink.invalidate()
			_wiggleAnimationDisplayLink = nil
		}

		let layer = self.layer

		//	Create the fixed header view
		//

		searchField.delegate = self
		searchField.placeholder = "Who drew..."
		searchField.returnKeyType = UIReturnKeyType.Search
		searchField.addTarget(self, action: "searchTextChanged:", forControlEvents: UIControlEvents.EditingChanged)

		fixedHeaderView.addSubview(searchField)
		view.addSubview(fixedHeaderView)


		//
		//	Make room for fixed header
		//

		collectionView.contentInset = UIEdgeInsets(top: fixedHeaderHeight + 20, left: 0, bottom: 0, right: 0)


		//
