View based NSTableView checkbox

I have an NSTableView that's view based, not the old cell based, and I'm doing everything via bindings. In one of my columns I now want a checkbox. I dragged a checkbox button (not a checkbox button cell) inside of the column's "Table Cell View".

Then I deleted the "Table View Cell" and its child. When I run, I don't see any checkboxes in the column. What's the right way to do this?