public void UpdateSlice( 
   SliceDefinition sliceDef
)

{
  // Note: call within QueuedTask.Run()
  {
    //Use the SelectedVariableProfile to get the slices currently in the TOC
    //via its associated volume
    var volume = voxelLayer.SelectedVariableProfile.Volume;
    var slices = volume.GetSlices();

    //Do something... e.g. make them visible
    foreach (var slice in slices)
    {
      slice.IsVisible = true;
      volume.UpdateSlice(slice);
    }

    //expand the slice container and make sure container visibility is true
    voxelLayer.SetSliceContainerExpanded(true);
    voxelLayer.SetSliceContainerVisibility(true);
  }
}

{
  // Note: call within QueuedTask.Run()
  {
    //To stop the Voxel Exploration Dockpane activating use:
    voxelLayer.AutoShowExploreDockPane = false;
    //This is useful if u have your own dockpane currently activated...
    //Normally, it would be set in your dockpane

    if (voxelLayer.Visualization != VoxelVisualization.Volume)
      voxelLayer.SetVisualization(VoxelVisualization.Volume);
    voxelLayer.SetSliceContainerVisibility(true);

    //Use the SelectedVariableProfile to get the slices currently in the TOC
    //via its associated volume
    var volume = voxelLayer.SelectedVariableProfile.Volume;
    var slice = volume.GetSlices().First(s => s.Name == "Change Tilt Slice");

    (double orientation, double tilt) = voxelLayer.GetOrientationAndTilt(slice.Normal);

    //Convert orientation and tilt to a normal
    slice.Normal = voxelLayer.GetNormal(orientation, 45.0);
    volume.UpdateSlice(slice);

    //reset if needed...Normally this might be when your dockpane
    //was de-activated (ie "closed")
    voxelLayer.AutoShowExploreDockPane = true;
  }
}