button.js

UM.registerUI('bold italic redo undo underline strikethrough superscript subscript insertorderedlist insertunorderedlist ' +
    'cleardoc selectall link unlink print preview justifyleft justifycenter justifyright justifyfull removeformat horizontal drafts',
    function(name) {
        var me = this;
        var $btn = $.eduibutton({
            icon : name,
            click : function(){
                me.execCommand(name);
            },
            title: this.getLang('labelMap')[name] || ''
        });

        this.addListener('selectionchange',function(){
            var state = this.queryCommandState(name);
            $btn.edui().disabled(state == -1).active(state == 1)
        });
        return $btn;
    }
);