The optimizer will create shell queries that do not contain the full execution plan but only a pointer to the full plan (not actual execution plans).Run the following qry and you should see plans and they will have a size of about 24k(24576) which is 3, 8k pages. for the shell plans.

this should help more....http://technet.microsoft.com/en-us/library/cc293623.aspx

select * from sys.dm_exec_cached_plans cp

cross apply sys.dm_exec_sql_text(cp.plan_handle)