Attached Workbook with Autocomplete Combobox

[swagatkarnany]

I have attached the excel sheet from http://www.contextures.com/xlDataVal11.html
This has a code for auto complete combo box but it does not auto complete that.When I type "ju" it should highlight "June" or "July" but it does not.
Is there anything I am doing wrong?I use excel 2007
http://www.contextures.com/xlDataVal11.html