Help with popups

Hello, I have a form "cars" with element "vehicle brand". This element is a dropdown with plugin databasejoin, connected to table "vehicle brands". On the form I would like to add a button near the vehicle brand dropdown with label "add new brand...". If I press this button I want to open a popup where it opens the form of "vehicle brands" table, so I can add a new brand. When I add the new brand I want also to update the values of vechicle brand dropdown in the first form. How can I do that?? Thanks for the attention
 
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