Private Sub txt_Status_AfterUpdate()
If Me.txt_Status = "open" Then
Me.YourTabControl.Enabled = True
Else
Me.YourTabControl.Enabled = False
End If
End Sub
Private Sub Form_Current()
If Me.txt_Status = "open" Then
Me.YourTabControl.Enabled = True
Else
Me.YourTabControl.Enabled = False
End If
End Sub