There's ways to simulate that I guess.
use a TEdit, TupDown and associate it to the TEDit and then use a TPOPUpMenu populated with the list of items
The Popup can be shown at will at what ever location you want.
Or use a TFORM with a TlistBox inside it and show that any time from the TEDIT Box and automate that a little by closing the form when ever it loses focus.. I do that with a custom TreeView list inside a TFORM and I close it when ever the mouse goes out side of it.