I'm feeling very stupid but no matter where I look I can't find what I'm doing wrong. I want to display a ListboxField that contains all the values I've specified in my listboxArray array. The values are there alright, I just can't set it to multiple select. I only ever get a one-value dropdownlist...
I also would like to know how to set the $size to use the size value returned by getAttributes...
$fields = parent::getCMSFields();
$fields->addFieldToTab("Root.Content.Main", new ListboxField(
$name = "Treatments",
$title = "All treatments offered by practitioner",
$source = $listboxArray,
What am I doing wrong?