Maybe using the "InputType=DropDownList" macro attribute approach might make a difference?
[DH_CustomText21:InputType=DropDownList,ListItems=3;7;30;60]
Also: I notice that you have lower case "T" in CustomText21. I don't know if this might be case-sensetive and so perhaps go with CustomText21 instead of Customtext21.
Jay Dymond
Here is my JS/Jquery
Jay Dymond
Helping You to Market, Sell and Service Better
www.1stdirect.com
www.GoldMineSuccess.com