MultiSelectField
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A field primarily for managing has_many and many_many relationships, but should
also work with Varchar fields.
Presents an interface composed of two listboxes with add/remove buttons to move
items from one box to the other. Sometimes refered to as an "options transfer"
field.
Code has now been rewritten to make it more portable:
- Extends standard SilverStripe CheckboxSetField and inherits it's constructor
- Degrades to a standard
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