Completion Checkbox

I want to add a completion checkbox to the Lightbox. This Completion needs to be mapped to a Completion field named “Complete” in my database which is a simple integer field (0=incomplete, 1=complete)

I have tried adding a Lightbox section and made type: “Checkbox” map_to “Complete”
I then get the following error:
Error: document.getElementById(e[f].id) is null
Source File:
Line: 177

What am I doing wrong

OK - I see what I was doing wrong. Did not include the dtmlxscheduler_editors.js script.

Works fine now.