UITableView section header 1px gloss/shadow overlapping

Here's how standard section header views handle scrolling/overlaping:

I'm trying to replicate the same behavior with custom section headers but all I get is this:

It seems that in the default behavior, the top 1px line of the bottom header view overlaps the bottom 1px line of th开发者_运维知识库e top header view. This can also be observed below the navbar, where that same top 1px line disappears underneath it.

Setting a contentInset on the tableview fixes the navbar situation, but not the overlapping issue. I've also tried playing with the maskToBounds and clipToBounds properties, but no luck. Any clue?

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As Mark Adams mentioned, there doesn't seem to be any public API to deal with this, so in my cellForRowAtIndexPath: method I did something along these lines:

if(isLastCellInSection)
    cell.drawBottomLine = NO;
else
    cell.drawBottomLine = YES;