Display image in MS Access Report based on value of action item field for each record

I want to display the image of a star for each action item record that has a value of 0 in a report. The star should display in place of the 0. The records are contained in a subform on the report.  This is the code that I have but it is not working. It currently displays a star for each record.

The code is located in the Detail Format on the main form.  

Private Sub Detail_Format(Cancel As Integer, FormatCount As Integer)
If Me!Mitigation_Events_Subreport.Form!Action_No = 0 Then
   
    Me!Mitigation_Events_Subreport.Form!Star.Visible = True
    Me!Mitigation_Events_Subreport.Form!Action_No.Visible = False
Else
    Me!Mitigation_Events_Subreport.Form!Star.Visible = False
    Me!Mitigation_Events_Subreport.Form!Action_No.Visible = True
End If
End Sub