Base_viewFieldLibrary/my_view_mode_listbox uses it, so to use it, you just have to make your listbox a proxyfield of Base_viewFieldLibrary/my_view_mode_listbox and make sure "list_action" property is delegated.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@15697 20353a03-c40f-0410-a6d1-a30d3c3de9de