Callbacks with a drop down with multi select

@adamschroeder Thank you! Yes that’s eventually what I ended up doing. For some reason, I thought I would see it in the documentation and I even though it said it was a list, I am getting an error in one of my functions where I am passing the variable assigned to the list (returned by the multi drop down) when I am trying to use append() in that function… I will continue to investigate that, but it was throwing me off for sure. Thanks again!