UIPopoverController, backgroundColor = clearColor

I had a UIT开发者_StackOverflow社区ableView that I replaced with a UIPopoverController. My UITableView's background was set to clearColor and it showed the custom background through the table. The table cells also matched the grey tint of my background image.

Now when I use the UIPopovercontroller, with the background set to clearColor, I can see through my UIPopoverController, but the color is the "standard" popover controller color. The kind of grey/blue tint. Is there a way to change that? Thanks.