Unable to Add Custom View in Lookup

Hi All,

I am trying to set Contact Entity and its custom view in attendirequired attribute of Appointment entity with the help of below link but unable to set.

Issue: By default in "attendirequired " lookup window shows "Account" entity and instead of this i want to set "Contact" entity bydefalut.

After follow same coding part still its showing Account entity by-default not contact entity.

Kindly help me is that possible or not. if yes then please help me what i am missing here.

https://community.dynamics.com/crm/b/crminogic/archive/2014/09/15/add-custom-view-in-lookup-and-disable-all-the-other-views