On Thu, 16 Feb 2017 20:27:22 +0100, Mike Wey wrote:

I don't have any issues with this example, either with or without the
bool constructor for gobject.Value.

Which version of Gtk are you using?

I use Gtk version 3.5.1

After your post I recognised my error.

        model.setValue(iter, 1, status);

I changed this line to take a Value

        model.setValue(iter, 1, new Value(status));

So it works as expected. Thanks.