C1CollectionView
----------------------------------------------------------------------------------------------
Shows how the C1FlexGrid takes advantage of the IC1CollectionView interface to expose grouping, sorting, and filtering.

The sample creates a ViewModel class with a Customers collection that is implemented using the 
C1CollectionView class. 

The Customers collection is bound to a C1FlexGrid control that recognizes the IC1CollectionView 
interface and exposes extended functionality such as grouping, sorting, filtering, and adding 
new items.

The ViewModel also exposes commands that add and remove customers from the collection, or refresh
the current view.