Customizing tabbar that is generated by docking widgets

Hi,

I'm trying to improve the looks of my application and I somehow cannot figure out how to customize some parts of the tab bars.

I have attached an image that shows and clarifies the questions.

Attachment 6673

Basically I want to be able to change the background of the tab bar, where the tabs are on.
I know you can create a parent widget and style the background color of that, but that doesn't work when using docking widgets, which automatically create tabs.

Is there a way to customize this? And also as the image shows there always appears some white line above the tabs. How can I get rid of that?

And last but not least, does anyone know how to change the spacing between dock widgets? I could do some hacks with borders around the dock widgets, but then resizing won't work properly I guess, as it wouldn't detect the area of the splitters. The space between the docks don't seem to be influenced by the QSplitter styles though.

Thanks,
- JB