Style to set isExpanded

   <Style TargetType="{x:Type grids:PropertyGridDataAccessorItem}">
      <Setter Property="IsExpanded" Value="True"/>
   </Style>

 I had this style working pre 2017.1, and have not had success figuring out the targettype I should replace it with. 

Also, I had this command binding

CommandManager.RegisterClassCommandBinding(typeof(MainWindow), new CommandBinding(PropertyGrid.ShowPropertyDialogCommand, OnShowPropertyDialogExecute, OnShowPropertyDialogCanExecute));

 and am wondering about the equivalent to the PropertyGrid.ShowPropertyDialogCommand. I just want to have the list expanded when the object is first shown in the property grid.

Thanks for any help -

Neil