 
 						UIGraphicsBeginImageContextWithOptions(size, true, 0)
 
-						self._thumbnailBackgroundColor.set()
+						self.thumbnailBackgroundColor.set()
 						UIRectFillUsingBlendMode(rect, kCGBlendModeNormal)
 
 						if !canceled() {

		let now = NSDate().timeIntervalSinceReferenceDate
		let cycle = now / WigglePhaseDuration
		let sign = (indexInCollection % 2 == 0) ? +1.0 : -1.0
		let phase = sin(cycle * M_PI + _cycleOffset * M_PI ) * sign
		let angle = CGFloat(phase * WiggleAngleMax)
		let layer = self.layer
		UIView.performWithoutAnimation { () -> Void in

		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 margin:CGFloat = 20
		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
	}

	override func didReceiveMemoryWarning() {
		dataSource.didReceiveMemoryWarning()
	}

	override func preferredStatusBarStyle() -> UIStatusBarStyle {
