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syntax to reference a combobox field on a subform

MeowserM asked
Last Modified: 2012-05-10

I have a form with a tab control on it.  In the tab control I have several subforms.  On the one subform I have a combobox field.  I am trying to write some vba code that says if the combobox field is null then display a message.  I have tried this several ways but I think I am not using the correct syntax to reference the combobox field.  I have a suspicion that I don't have the right subform name.  
Here is the code I have right now:
If IsNull(Forms!FrmAudit!AuditScheduleDetail.cboAuditElement) Then
MsgBox ("You must enter something in AuditElement field")
End If

Thank you in advance

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