I try a proof of concept. I have an app that it composed of a window and a UserControl that uses the wpfgrid. the window create an instance of the userControl when conditions are met. The user control is binded in code behind . The grid datasource is binded dynamically  with a DataGridCollectionView. then a column with button is created using a template define as resource in the xaml part of the userControl.

 private void AddColumn()
        {
            string label = "MyNewColumn";
            CellEditor buttonCellEditor = new CellEditor();
            buttonCellEditor.EditTemplate = (DataTemplate)Resources["MyTemplate"];
            Column column = new Column();
            column.FieldName = "id";
            column.Title = label;
            column.CellEditor = buttonCellEditor;
            column.CellContentTemplate = buttonCellEditor.EditTemplate;
            column.VisiblePosition = 0;
            MyGrid.Columns.Add(column);
        }

         <Style  TargetType="{x:Type Button}" x:Key="MyStyle">
            <EventSetter Event="Click" Handler="Button_Click"/>
        </Style>
        <DataTemplate x:Key="MyTemplate">
            <Button Style="{StaticResource MyStyle}" Content="Click Me" ></Button>
        </DataTemplate>

---------

  internal void Button_Click(object sender, RoutedEventArgs e)
 {
            int rowIndex = (((System.Windows.Data.CollectionView)(MyGrid.ItemsSource))).CurrentPosition;
            //do something
  }

the Grid is displayed properly, but the CurrentPosition always = 0, no matter which row is clicked.

Any clue?

Thanks