[TYPO3-mvc] Howto use objects in select with multiple option

[Steffen Ritter]

Hi List,

I have an object which contains a 1-n relation to other objects 
(foreign_field).
In my edit/update form I have an select field with "multiple" option, 
showing all possible object to attach.

How do I have to define the property, getter and setters correctly to 
use a multiselect field in this constellation.

regards

Steffen