Combobox property "Match Required" has no apparent effect

I developed the attached as a prototype to demonstrate how a combobox control can be set up in a worksheet. The request included the requirement to limit the user to being able to enter values only from the associated list. I set the "Match Required" property to True but the combobox still allows me to enter any value at all.

Am I misinterpreting what this property does? Example attached.

Originally Posted by Excel Help

If the MatchRequired property is True, the user cannot exit the ComboBox until the text entered matches an entry in the existing list. MatchRequired maintains the integrity of the list by requiring the user to select an existing entry.

Thanks for referring me to that. The specific post that answers the question is at

http://www.excelforum.com/867801-post3.html

The Style property must be set to fmStyleDropdownList.