Commented Unassigned: Insertion row is impossible [22266]

I'm trying to provide support for adding a new row for user (like in WPF Toolkit data grid) and cannot find a way how.
There is the way how to added new row:
https://xceed.com/wp-content/documentation/xceed-toolkit-plus-for-wpf/webframe.html#Inserting_Data.html
But this class InsertionRow is actually unavailable.
How can I provide convenient way to add a new record for user?
Comments: ** Comment from web user: BoucherS **

Hi,

The Xceed DataGrid included in the Community/Plus Editions of the Toolkit has less options than the Official Xceed DataGrid. The InsertionRow is one of these options. You can find these "advanced " options here : https://wpftoolkit.codeplex.com/wikipage?title=Advanced%20DataGrid&referringTitle=DataGrid

If you want the InsertionRow, you need to buy the Official Xceed DataGrid here : https://xceed.com/xceed-datagrid-for-wpf/

As said in the Documentation ( https://wpftoolkit.codeplex.com/wikipage?title=DataGrid ), "bear in mind that that product's documentation covers features that may not be available in this Toolkit version."

Thanks