Header br widget icon highlited

[Batninja]

Hi

Can anyone advise how to set the highlighted of an icon in the Header bar widget please?

The blog post shows how to change the name or icon but I can't see from the API docs or the post how to get at the highlighted property of an icon in the header bar widget.

I am trying to use a header bar icon button to show/hide editing buttons on the card and I want the icon button to be a toggle switch. I could do it with a text button but that's not the style of the app.

Many thanks for any assistance provided.

Roger