public IReadOnlyList<SectionDefinition> GetSelectedSections()

{
  var surfaces = MapView.Active.GetSelectedIsosurfaces();
  //set selected w/ MapView.Active.SelectVoxelIsosurface(isoSurface)
  var slices = MapView.Active.GetSelectedSlices();
  //set selected w/ MapView.Active.SelectVoxelSlice(slice)
  var sections = MapView.Active.GetSelectedSections();
  //set selected w/ MapView.Active.SelectVoxelSection(section)
  var locked_sections = MapView.Active.GetSelectedLockedSections();
  //set selected w/ MapView.Active.SelectVoxelLockedSection(locked_section)
}

{
  var section = MapView.Active?.GetSelectedSections()?.FirstOrDefault();
  if (section != null)
  {
    //Do something with the section
  }
}

{
  voxelLayer = null;
  var section = MapView.Active?.GetSelectedSections()?.FirstOrDefault();
  if (section != null)
  {
    voxelLayer = section.Layer;
    //TODO - use the layer
  }
}

{
  // Note: call within QueuedTask.Run()
  {
    if (voxelLayer.Visualization != VoxelVisualization.Surface)
      voxelLayer.SetVisualization(VoxelVisualization.Surface);
    voxelLayer.SetSectionContainerExpanded(true);
    voxelLayer.SetLockedSectionContainerExpanded(true);
    voxelLayer.SetLockedSectionContainerVisibility(true);

    //Use the SelectedVariableProfile to get the sections
    //via its associated volume
    var volume = voxelLayer.SelectedVariableProfile.Volume;

    //get the selected section
    var section = MapView.Active.GetSelectedSections().FirstOrDefault();
    if (section == null)
    {
      section = volume.GetSections().FirstOrDefault();
    }

    if (section == null)
      return;

    //Lock the section (Creates a locked section, deletes
    //the section)
    //if (voxelLayer.CanLockSection(section))
    //	voxelLayer.LockSection(section);
    if (volume.CanLockSection(section))
      volume.LockSection(section);
  }
}