Dynamics CRM - Object does not support property or method 'addOnKeyPress'

I am working on Dynamics CRM 9.1 version.

I have requirement to AutoComplete  a single line text filed 'Country' on 'Address' entity(OOB entity).

I was trying Xrm.Page.getControl("country").addOnKeyPress(keyPressFcn) on load, but i see error message that - Object does not support property or method 'addOnKeyPress'.

But when I try 'addOnKeyPress' method on Account entity it was work as expected. 

Any suggestion how can I achieve the same on 'Address' entity(OOB entity).