code: def render_children(self, context, fragment, can_reorder=True, can_add=False):
          
          contents = []
  
          child_context = {'reorderable_items': set()}
          if context:
              child_context.update(context)
  
          for child_id in self.children:
              child = self.runtime.get_block(child_id)
              if can_reorder:
                  child_context['reorderable_items'].add(child.scope_ids.usage_id)
              view_to_render = 'author_view' if hasattr(child, 'author_view') else 'student_view'
              rendered_child = child.render(view_to_render, child_context)
              fragment.add_frag_resources(rendered_child)
  
              contents.append({
                  'id': text_type(child.scope_ids.usage_id),
                  'content': rendered_child.content
              })
  
          fragment.add_content(self.runtime.render_template("studio_render_children_view.html", {
              'items': contents,
              'xblock_context': context,
              'can_add': can_add,
              'can_reorder': can_reorder,
          }))
docs: Renders the children of the module with HTML appropriate for Studio. If can_reorder is
          True, then the children will be rendered to support drag and drop.