Fix Window Phone LongListSelector dynamic binding exception

Sometime, you are receive an exception error when using Window Phone Toolkit LongListSelector control. It occur while you are trying to modify ItemsSource which is ObservableCollection (or any implement INotifyCollectionChanged interface) of the LongListSelector control.

The error message can form: ArgumentOutOfRangeException is being thrown within InsertNewGroups in LongListSelector.cs
And the part of stack trace could be: