old_contents: from wagtail.core import blocks
  from wagtail.core.fields import StreamField
  from wagtail.admin.edit_handlers import TabbedInterface, StreamFieldPanel, ObjectList
  
  from falmer.content.blocks import HeroImageBlock, FalmerImageChooserBlock
  from falmer.content.models.core import Page
  
  
  class GridItem(blocks.StructBlock):
      title = blocks.CharBlock(required=True)
      link = blocks.URLBlock()
      image = FalmerImageChooserBlock()
  
      class Meta:
          icon = 'item'
  
  
  class SelectionGridPage(Page):
      parent_page_types = []
  
      body = StreamField([
          ('heading_hero', HeroImageBlock()),
          ('selection_grid', blocks.ListBlock(GridItem)),
      ])
  
      content_panels = Page.content_panels + [
          StreamFieldPanel('body'),
      ]
  
      edit_handler = TabbedInterface([
          ObjectList(content_panels, heading='Content'),
          ObjectList(Page.promote_panels, heading='Promote'),
          ObjectList(Page.settings_panels, heading='Settings', classname="settings"),
      ])
  
      type_fields = (
          'body',
      )
  
new_contents: from wagtail.core import blocks
  from wagtail.core.blocks import RichTextBlock
  from wagtail.core.fields import StreamField
  from wagtail.admin.edit_handlers import TabbedInterface, StreamFieldPanel, ObjectList
  
  from falmer.content.blocks import HeroImageBlock, FalmerImageChooserBlock
  from falmer.content.models.core import Page
  
  
  class GridItem(blocks.StructBlock):
      title = blocks.CharBlock(required=True)
      link = blocks.URLBlock()
      image = FalmerImageChooserBlock()
      description = RichTextBlock(required=False)
  
      class Meta:
          icon = 'item'
  
  
  class SelectionGridPage(Page):
      body = StreamField([
          ('heading_hero', HeroImageBlock()),
          ('selection_grid', blocks.ListBlock(GridItem)),
      ])
  
      content_panels = Page.content_panels + [
          StreamFieldPanel('body'),
      ]
  
      edit_handler = TabbedInterface([
          ObjectList(content_panels, heading='Content'),
          ObjectList(Page.promote_panels, heading='Promote'),
          ObjectList(Page.settings_panels, heading='Settings', classname="settings"),
      ])
  
      type_fields = (
          'body',
      )
  
subject: Add description to selectiongrid items