xce4-xkb displays the current keyboard layout and refreshes when the layout changes. Also the layout can be switched by simply clicking on the plugin. This plugin is used along with the XKB extension. For now the keyboard layouts cannot be configured from the plugin itself, they should be set in the xorg.conf file or some other way (e.g. setxkbmap).
WWW: http://goodies.xfce.org/projects/panel-plugins/xfce4-xkb-plugin
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