Do you mean the little "x" close button in the upper right hand corner, or do you mean a close button that you created yourself in the TitleWindow? I had a similar problem when I created my own close and cancel buttons, and it was because I had not embeded the button images in the skin that I created. If you have your own skins for a button that you created, I could give you some advice, otherwise, I have no idea :)
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