Private Sub Worksheet_SelectionChange(ByVal Target As Range)
    If Not Intersect(Target, Range("A4")) Is Nothing Then Call ClearActiveXControlCheckBoxesInRange(Me.[C6:E13])
End Sub
'---------------------------
'Manip sur Contrôles ActiveX
'---------------------------
Sub ClearActiveXControlCheckBoxesInRange(Rng As Range)
    Dim Shp As Shape
 
    For Each Shp In ActiveSheet.Shapes
        'La Shape est un ActiveX Control
        If Shp.Type = msoOLEControlObject Then
            'La Shape est une CheckBox
            If TypeName(Shp.OLEFormat.Object.Object) = "CheckBox" Then
                'La Shape est dans le Range demandé
                If Not Intersect(Rng, Shp.TopLeftCell) Is Nothing Then
                    Shp.OLEFormat.Object.Object.Value = False
                End If
            End If
        End If
    Next
End Sub