Changing objectdock tabbed background

I'm having some problems with the objectdock tabbed background. I want it to look like this when I click on it.

But when I click on it I get this:

I've looked at all the options in objectdock but I can't find anything.

Thanks.

You need to resize the drawer so it's the proper shape. Grab one of the corners and just drag it til it's the long narrow shape instead.

Nevermind. I feel like an idiot. Check out the video that helped me: