Dropdown auto refresh?

I have a form with a dropdown input to select a certain year. In case the user wants to select a year that isn't available, I would like to give the user the opportunity to add this year himself. So next to the dropdown input I placed a button which opens a pop-up form to add a year. When the user saves and closes the popup-form with the newly created year, should this result in a refresh of the dropdownlist and thus an extra option in the dropdownlist? Because now it doesn't.
1 answers

I think the best option is to make a custom save on the new year button and have that retrieve the related parent object (with the dropdown) and give it a change object (refresh in client).