How to add Create Button in Relate popup mode

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From what I can tell, you need to make a FormBase file,
and reference it from within the popupdef
(taken from Accounts popupdef)

...
    'create' => array(
        'formBase' => 'AccountFormBase.php',
        'formBaseClass' => 'AccountFormBase',
        'getFormBodyParams' => array('', '', 'AccountSave'),
        'createButton' => 'LNK_NEW_ACCOUNT',
    ),

I’ll be making my own now for Meetings module

I also found the following thread