Not able to select parent customer name in CRM 2011 Mobile express window

Hi,

I am trying to create new contact in CRM 2011 mobile express window but I can' t select parent customer name.  when I select dropdown list it give account and contact. when I select account it select account as parent customer name as mentioned in screen-shot.  It did not give further lookup to select existing accounts from the list.  Kindly help to solve this issue.

pnoushu@hotmail.com