Some customers wants to manage the tag with only one tool.Tealium
customers set the tag directory in the page, therefor it causes some
trouble for managing tag.So, they want to manage the tag with one tool.
Drop downs are harder to track than other elements. I have run into
issues with different browsers and such when wanting to do anything
beyond the very basic. I think you will either have to post the code
snippet for your drop down or will need to link to it here and show us
what drop down you want tracked and maybe we can offer support that way.