Sometimes I need to erase the selection the user made from the combobox; style set to (2-Dropdown list).

My drop down list is based on fields from a table

IE:

If there are three item options in the drop down list window, and even if the user selected item three, I might need to erase the selection, and force the user to reselect. When I need this to occure "EMPTY" must be displayed as the DisplayValue, instead of an actual selection.

Is this possible?

Thanks in advance