Remove the padding around AuiNotebook tab content

I’m experimenting with AuiNotebook. With AuiDefaultTabArt artProvider the tabs itself look nice but the content area has unwanted padding (at least in Windows 10). With AuiSimpleTabArt the padding is gone, but the tabs look a bit dull.

Can I somehow tweak AuiDefaultTabArt to remove the padding? Which methods should I override and how?

Best regards,

hello, same question here.
I’ve tried to tamper of agw.aui.auibook but can’t figure it out. I would like to obtain something similar to the attached image: no lines between tab and control (grid in this case) inside the page (this image is obtained with a normal notebook and grid label renderer)