>>How do you link the column to that checkbox in the container ?
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>After you add the container to the column (this may take a couple visual tries to get the check box centered just right , setting top & left)), you'll need to set the Controlsource of both the column and the checkbox to the correct field. That will do the trick...

In addition to what Bruce said, since it's a CheckBox you will want to ensure that the columns CurrentControl is set to the Checkbox and ther column's Sparse setting is .F. so that the box appears in all grid cells not just the highlighted one.