code: @Nullable
    protected final String getSelectedObjectID (@Nonnull final WPECTYPE aWPEC)
    {
      return aWPEC.params ().getAsString (CPageParam.PARAM_OBJECT);
    }
docs: Get the ID of the selected object from the passed execution context.
  
  @param aWPEC
  The current web page execution context. Never <code>null</code>.
  @return <code>null</code> if no selected object is present.