With the few details you gave us, we can only guess at the solution and that's not good for anyone
What sort of app are you testing?
What is the drop down for? Do you really need that?
Is your drop down box in the name mapping?
Are you trying to choose something from the drop down to use in your test or are validating the contents?
The more details you can give us, the better the answer we can give you.
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