How to populate the properties in a combobox using custom value picker

Hi all,
Following is a great post regarding how to decorate our properties with custom value pickers that allow you to more easily gain access to an element name. My requirement is to populate the properties in a combo box when the user picks an element using the custom value picker.

http://www.kirupa.com/blend_silverlight/state_element_storybord_pickers.htm

Thanks in advance

Thanks and Regards
Ashique