How can I use .OnAction for an ActiveX Checkbox

I have a button that generates ActiveX checkboxes based on a range of cells that the user selects. These checkboxes are linked to their corresponding cell. Additionally, a master checkbox is generated along with them that is intended to check/uncheck the rest of the checkboxes.

What I am trying to do is have an event occur when this master checkbox is checked and ends up checking the rest.

I was thinking of something like this which is the creation of my Master Checkbox:

Sub AddMasterCheckbox(cbNum As Integer, cbIdent As String, Rng As Range)
Dim name
With ActiveSheet.OLEObjects.Add(ClassType:="Forms.CheckBox.1", _
    Left:=1033.5, Top:=Rng.Top, Width:=150.5, Height:=20.75)
    If cbNum < 10 Then
        .name = "NewCheckBox" & cbIdent & "0" & cbNum
    Else
        .name = "NewCheckBox" & cbIdent & cbNum
    End If
    name = .name
    .Object.Caption = "Select all for this Machine"
    .Object.OnAction = "'SelectAll ""name""'"
End With
End Sub

However, I am getting an error, stating that this is not supported. Essentially, I have another subprogram called SelectAll which ideally would be called when the master checkbox is clicked.

How can I go about to doing this?