Please ensure that the following condition has been met in order to implement Bottom NewRowPosition.

• CanUserAddRows sets to True.
• EmptyRowsVisibility sets to Visible.
• ItemsSource property is an editable property.
  
  For example: when create a project using Intersoft ClientUI MVVM Data Application (WCF RIA) project template, we should be able to find LoadData() method – the method which is called when the data repository needs to fetch data from the repository, either during initial load, or due to query change – in GridViewModelGenericBase.cs class.
  
  The original code is as follow.

  protected virtual void LoadData()
  {
      this.IsBusy = true;
      this.DataSource.GetData
      (
          ...
          (items) =>
          {
              this.IsBusy = false;
              this.Items = new PagedCollectionView(items);
          },
          ...
      );
  }

  
  
  The above code will causing the same problem, can’t add new row. Modifying the code into the following will solve the problem.
  
  

  protected virtual void LoadData()
  {
      this.IsBusy = true;
      this.DataSource.GetData
      (
          ...
          (items) =>
          {
              this.IsBusy = false;
              this.Items = new PagedCollectionView(new ObservableCollection<T>(items.Cast<T>()));
          },
          ...
      );
  }

Hope this helps.