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Lookup fields of Custom Objects
Is there any limitations in Force.com Sites for lookup fields of custom objects? I was unable to display lookup field of custom object in public page. But it works for preview. I granted all permissions to that object. I checked with adding lookup field of standard object (Account) and It works for me. More specifically I want to use Contacts as lookup field in my custom object.
you need to enable the lookup standard page for your site. Site details> standard pages> edit> enable lookup page> save.
vusualforce uses standard lookup.jsp page for lookup pop-up.