acceptableFlavors
Syntax
[the] acceptableFlavors of <buttonOrFieldOrGraphicOrCardOrBackground>
set the acceptableFlavors of field "Popup" to "public.file-url,public.plain-text"
Explanation
The acceptableFlavors
property controls what types of data can be dropped onto
an object using the system-wide drag & drop services from other applications or
across windows.