Change UIbutton color inside UITableViewCell

I have a simple problem ... but its turning into a very difficult problem .. i have a button inside uitableviewcell and want to change its color through code .... i could aceive it by changing its background image. But its kinna hazy ... its not the solid color ... and when i use [cell.button setBackgroundColor:[UIcolor redColor]] ... the button color does not change ...
any help appreciated
thanks

Thanks for the fast answere.
Unfortunately there is no effect when I include
buttonName.backgroundColor = UIColor redColor;
In my application I have a NSTimer which calls every 2 sec. a method which should change the color of the button. I would be also happy if the display blinks red and normal...

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