Filter cases list of an Entitlement on a Entitlement detail page

Hi, Can anyone tell me how to add Cases related to an Entitlement as a Related list on an Entitlement Detail Page. Right now when i open an entitlement (Entitlement detail page), all the Case records within the object are showing up in the Related list. What condition Do i need to have in-order to see only the Cases related to Entitlement. Can anyone help me out with this issue? This issue is blocking me from Deploying the page Thanks.