public void SelectVoxelIsosurface( 
   IsosurfaceDefinition isosurface
)

{
  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)
}