I am using official JQuery UI Dialog, If I use the Lightness theme, everything is OK. In Redmond theme, however, the close button will be hidden behind the blue color, not visible. How to change css and make it appear ?
I made a test using this url : http://jqueryui.com/demos/dialog/ and with Redmond theme it works fine. Your problem is probably coming from a change in the jquery-ui css or another rule that is in your code. Post a link in order to see where is your problem.