Disable a control

I

Ivor Williams

I have a form with a subform. On the form is a command button which closes
the form. In the subform there is a checkbox for each record. I want to
disable the command button on the main form whenever the value in the
checkbox for any record on the subform is -1. I'm not quite sure which event
to use on which control to accomplish this.

Ivor
 
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