คุณสมบัติ 'สามสถานะ' (TripleState)

Dim strTripleState As String
strTripleState = Forms.Item("frmOperations").Controls.Item("Check1").TripleState
Select Case strTripleState
    Case True
        MsgBox "For Check1, TripleState = " & strTripleState & _
            ". The control will cycle through states for Yes, No, " & _
            "and Null values. The control appears dimmed (grayed) " & _
            "when its Value property is set to Null."
    Case False
        MsgBox "For Check1, TripleState = " & strTripleState & _
            ". The control will cycle through states for Yes and No " & _
            "values. Null values display as if they were No values."
    Case Else
        MsgBox "Can't determine the TripleState property for Check1."
End Select