Here we have the country table. we want to display county LANDX as drop down.
Create an web dynpro component.
Create an attribute.
Design the layout with a drop down key element and bind it to the context attribute.
Put the code in the method and run the application.
Here we have thr drop down list.
SAPCODES 
Thanks a lot for this wonderful blog. I have used this same implementation I have done in a custom WDA pop-up and added this to SRM portal. The dropdownbykey element is not showing values when opened in portal but works fine when launched thru wendynpro application. It means that valuelist binding is happening but looks like issue in portal. Can you help me solve this issue?
We are using SAP SRM 714.
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