public VoxelAssetEventArgs.VoxelAssetChangeType ChangeType {get;}

{
  MapMemberPropertiesChangedEvent.Subscribe((args) =>
  {
    var voxel = args.MapMembers.OfType<VoxelLayer>().FirstOrDefault();
    if (voxel == null)
      return;
    //Anything changed on a voxel layer?
    if (args.EventHints.Any(hint => hint == MapMemberEventHint.VoxelSelectedVariable))
    {
      //Voxel variable profile selection changed
      var changed_variable_name = voxel.SelectedVariableProfile.Variable;
      //TODO respond to change, use QueuedTask if needed

    }
    else if (args.EventHints.Any(hint => hint == MapMemberEventHint.Renderer))
    {
      //This can fire when a renderer becomes ready on a new layer; the selected variable profile
      //is changed; visualization is changed, etc.
      var renderer = voxel.SelectedVariableProfile.Renderer;
      //TODO respond to change, use QueuedTask if needed

    }
  });

  VoxelAssetChangedEvent.Subscribe((args) =>
  {
    //An asset changed on a voxel layer
    System.Diagnostics.Debug.WriteLine("");
    System.Diagnostics.Debug.WriteLine("VoxelAssetChangedEvent");
    System.Diagnostics.Debug.WriteLine($" AssetType: {args.AssetType}, ChangeType: {args.ChangeType}");

    if (args.ChangeType == VoxelAssetEventArgs.VoxelAssetChangeType.Remove)
      return;
    //Get "what"changed - add or update
    //eg IsoSurface
    VoxelLayer voxelLayer = null;
    if (args.AssetType == VoxelAssetEventArgs.VoxelAssetType.Isosurface)
    {
      var surface = MapView.Active.GetSelectedIsosurfaces().FirstOrDefault();
      //there will only be one selected...
      if (surface != null)
      {
        voxelLayer = surface.Layer;
        //TODO respond to change, use QueuedTask if needed
      }
    }
    //Repeat for Slices, Sections, LockedSections...
    //GetSelectedSlices(), GetSelectedSections(), GetSelectedLockedSections();
  });
}