SubForm ComboBox

[romio]

I have my form and Subform I have used the Datasheet to view them, on my Subform I have my Combo Box (EX. Year with the values 2000, 2001 etc) When I view the form it shows that its a textbox till I click on it then it drops down the value list, I need to show the arrow on the right side in order to know it is a combo box, the wired thing is on main form when I added the combo Box it does always show it as combo Box but when I did the same thing in my Subform it wouldn’t, How can I do that.

Thanks.