Hello all, I'm using ExtJS 4.1.1 and I have a toolbar with a drop down menu (defined as tbar within the Viewport). When I run my code on a network that doesn't have internet access I get these unsightly red x's next to my menu options. When I right click, it says it's looking for an image http://www.sencha.com/s.gif. When I go on the internet, I see that this image is just a black 1 x 1 gif. Is there anyway to disable this or override it?