Android/Monodroid ApplyTransformation Not Called

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http://stackoverflow.com – I am using a custom animation to expand and contract my view, found on another answer here on SO. My problem is, ApplyTransformation never gets called therefore, nothing happens. Is there anything else I'm supposed to be doing? private void BrandTextClicked (object sender, EventArgs e) { Animation animation = null; if (expanded) { animation = new ExpandAnimation (listView, 0, height); } else { animation = new ExpandAnimation(listView, height, 0); } animation.Duration = 500; animation.Interpolator = new AccelerateInterpolator(1); listView.Animation (HowTos)