OrientationChanged

Targets iOS
1

I put the following in the above event but it doesn’t work but if I put it in the Resized event it does. Should it work in OrientationChanged?

If System.Device.Orientation = System.DeviceData.Orientations.Portrait Then
  MessageBox("Portrait")
  ListBox.Visible = false
end if
If System.Device.Orientation = System.DeviceData.Orientations.LandscapeLeft Then
  MessageBox("landscape")
  ListBox.Visible = true
End If
If System.Device.Orientation = System.DeviceData.Orientations.LandscapeRight Then
  MessageBox("landscape")
  ListBox.Visible = true
End If
2

If I were to add a Constraint is it best in the Resized Event or the OrientationChanged Event?