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How to refresh database after closing Oracle APEX modal dialog?

I am working on an Oracle APEX application and have the following situation on my hands: A user is able to launch a modal dialog in order to create a receipt record that includes as a field the 'load site'. As new load sites are continually being added I added a button to that dialog that opens another dialog that allows the user to enter the details of the new load site. After closing that dialog they should be able to find that load site in the load site field. However, I have to refresh the page and reopen the receipt record dialog in order for the newly created load site entry to be in the drop down list. How can I rectify this situation so that after closing the 'add new load site' modal the newly added added load site will be present in the underlying modal?