TableView - How to implement editing grouped rows by using editors in the GroupRow

This example illustrates how to display a corresponding editor in the GroupRow based on GridColumn.EditSettings. When this editor loses focus, the entered value is provided into the corresponding GridColumn cells for all rows in this group. 
This behavior is achieved by implementing the EditorWrapper control, which dynamically creates an editor based on the column's settings. It also handles the PreviewKeyDown and LostKeyboardFocus events for an editor and posts changes to the datasource in the handlers.