WPF PropertyGrid with DropDown

Hi,

I'm new to WPF and I want to dispaly my Person Object in the PropertyGrid control, my problem is how to use a dropdown to edit a specefic property.

 I searched over the internet, but could not find the clear solution to achieve this task. maybe because I am using VS2012 (VB) and the examples I found for earlier versions.

Can anyone provide the Vb code (in single file if possible) to achieve this task.

Excuse my ignorance, and Thanks in advance.