Adding Admin Columns to CPT display

Hi Anh -

for some reason, I can't get any custom admin columns to appear in my list... to keep it simple, I just wanted to display one custom field in the admin column...

I added a custom attribute "admin_columns => true" and it didn't work. but I also have 2 other issues that you are working on for, so maybe this is connected?

1. when I add any values to the custom field form for my CPT "Packages" - the values dont' save when I click Submit. so if no values are stored for my custom field that I want displayed in admin columns, will that prevent the title of the column from displaying too?

2. I'm using groups of fields, and the field I want displayed in admin columns comes from a group. you are working on Beaver Themer issue not displaying fields in groups, so I'm wondering if this is the same issue?

see here: https://snag.gy/PN4MBu.jpg