Use a dropdown of checkboxes for your reference set.
Widgets5 stars, based on 8 votes
Erik Klein Geltink
4/5starsGreat UI element for multi select in forms.
So much better than using a data grid with popup solution...
Hopefully it'll move to the core set of custom widgets (with Mendix support) soon.
5/5starsVery helpful widget that we use pervasively in our current development project.