 			case .Began:
 				originalPosition = v.position
 				toggleStatusBar(true)
-				SideNavigationViewController.backdropLayer.hidden = false
+				backdropLayer.hidden = false
 			case .Changed:
 				let translation: CGPoint = recognizer.translationInView(v)
 				let w: CGFloat = v.width

	*/
	public var leftTapGesture: UITapGestureRecognizer?
	
	//
	//	:name:	leftOriginX
	//
	private var leftOriginX: CGFloat {
		return -240
	}
	
	/**

		if let vc = leftView {
			let w: CGFloat = vc.width
			let h: CGFloat = vc.height
			let d: Double = Double(0 == velocity ? animationDuration : fmax(0.1, fmin(1, Double(vc.x / velocity))))
			
			MaterialAnimation.animationWithDuration(d, animations: {
				vc.position = CGPointMake(-w / 2, h / 2)
				self.backdropLayer.hidden = true
			}) {
				self.isUserInteractionEnabled = true
				self.toggleStatusBar(false)
			}
