when i use custom rendering template from within the list level content type i.e; from schema .xml sharepoint is able to show my new form when "add new item" is clicked .However,if i define same custom rendering template in a custom site level content type and refer it list definition(schema.xml) using contenttyperef element sharepoint still shows Out ot box newform.aspx and is unable to render custom page declared as custom rendering template.What might be the reason behind this?