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no, custom dialogs only accept text input with an option of password masking. You can script validation for the custom dialog and have them repeat until they enter a correct value, otherwise you'll need to build something like a popover or new window instead of using a custom dialog for full control.
Also FYI, I think there ARE dialog generating plugins out there that do allow for dialog boxes with dropdowns. It's just not something you can do natively.
Check out this plugin:
Thanks Mike! I'll check out the plug in. Appreciate the help.