NSTableView weird behavior

Symadept <[email protected]>
Newsgroups gmane.comp.macosx.devel
Message-ID <[email protected]> 
Hi,
I am implementing the functionality of the NSTableview in such a way that
once a cell is selected the background image shall be shown as some image,
HighlightedCell.png otherwise DefaultCell.png. If both the images are
solid(Opaque) coloured then there is no issue. If the DefaultCell.png
happens to be Transparent(Alpha <1.0) Coloured then the issue starts.

For your reference can refer the link,

http://www.4shared.com/file/142077560/af2d2a44/CustomTable.html

Regards
symadept
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