Look at Step #7 a little more closely: https://github.com/sqville/sqv
You need to set the button's appearance to "search-button" and not "fa-search". You are seeing that error because you are directly asking the Button to show the font icon rather than the Image, and it's the Image that has the new properties mixed into it and not the Button class. When you set the Button's appearance to "search-button" the Appearance.js that get's mixed into the current theme's appearance file has this entry in it that set's the button's icon to "fa-search": "search-button/icon" : "fa-search" -- View this message in context: http://qooxdoo.678.n2.nabble.com/FontAwesome-font-icons-for-qx-Desktop-tp7587151p7587195.html Sent from the qooxdoo mailing list archive at Nabble.com. ------------------------------------------------------------------------------ _______________________________________________ qooxdoo-devel mailing list qooxdoo-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/qooxdoo-devel