I too am an ExtJs newbie, and am having trouble with this example. When I invoke it, the new window is generated, but there is no Ajax call to retrieve text to display within the window. I've tried this on two servers, one using Apache and the other using Apache2 - same failed result. I've tried it on Firefox 3.5 and Chrome 9, and used both firebug and Google dev tools and see no errors or problems. Any assistance would be greatly appreciated!