CheckboxSetField which works with Int fields, ORing bits. An alternative to trying to use MultiEnum.
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README.md

BitfieldSetField

Author: Luke Hudson lukeletters@gmail.com

This is essentially a CheckboxSetField but it reads and writes to an Int field, ORing the values chosen. To use it, provide it with a source array in the constructor, which maps bit values to labels.

Example

// In your DB definition, create an Int field
static $db = array(
    . . .
    'Format'    =>  'Int'
);

. . .

// in getCMSFields, initialise the control, providing bit=>label mapping.
// Remember, the array indices represent bit values, so must be powers of two!
function getCMSFields() {
    . . .
    $formats = array(
        1   =>  'Print',
        2   =>  'Online',
        4   =>  'Email'
    );
    $fields->push( new BitfieldSetField('Format', null, $formats) );