Slider control doesn't follow model's property value.

Slider control doesn't follow model's property value. Model implements
INotifyPropertyChanged interface and exposes a property that notifies when its
value changes. This property is bound (two-way) to slider's value. According to
MVVM pattern view must follow model state. Which means slider has to check on
property value after modifying it. Because sometimes value remains unchanged
when slider attempts to change it.

Here is the video demonstrating this issue: http://www.screencast.com/t/MmjDP7zY

Posted bug report: https://bugzilla.xamarin.com/show_bug.cgi?id=28764