Problem with the table view's _visibleBounds when used on a scroll view

I've had numerous problems with getting a table view to work on a scroll view since the table view keeps resizing (http://discussions.apple.com/thread.jspa?threadID=2618816&tstart=0)
I have created the views in IB. The scroll view is attached to the controller's view, and is assigned as the controller's view. The frame size of the scroll view is 320x436. I am manually setting the content size in code:
UIScrollView* tempScrollView = (UIScrollView*) self.view;
tempScrollView.contentSize = CGSizeMake(320, 720);
The table view's frame's width/height is set to 280x88 in IB (i.e the size of two cells), and the header and footer are set to size 0.
However, when I run the code, the table view is smaller, it is only 280x68. I have looked in the debugger, and the table view's _contentSize (of its scroll view) is 280x88; however, the _visibleBounds property is 280x68.
I've tried looking into the documentation for the UITableView class, but can't find anything on the _visibleBounds property, or where it is being set and how to force it to the correct size.
If anybody has any advice, I'd appreciate it.

I can get around this problem by going to the scrollview which the tableview belongs to, and unchecking the Autoresize Subviews box.
But if anybody knows about the _visibleBounds property, or the rules which are applied when resizing subviews, I'd be interested.

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