Gets or sets a value that indicates whether the user can add new rows to the DataGrid.
Assembly: PresentationFramework (in PresentationFramework.dll)
When this property is set to true a blank row is displayed at the bottom of the DataGrid. A user can enter a new item into the blank row. Adding a new row adds an item to the ItemsSource. You can set default values for the new item by handling the InitializingNewItem event and setting the values programmatically.
Available since 4.0