How can I add two icons to button

I want to create a button with two icons. One at the left edge and at the right edge. How can I do it?

example: https://archive.qooxdoo.org/current/playground/#Hello%20World-ria

The idea is to redefine _createChildControlImpl method and create the second icon there:

qx.Class.define("myapp.Button", {
    extend : qx.ui.form.Button,

    construct(name, path){
        this.base(arguments, name, path);
        this._createChildControl("secondicon");
    },

    members: {
        _createChildControlImpl(id, hash){
            let control;
            switch(id) {
                case "secondicon":
                    control = new qx.ui.basic.Image(this.getIcon());
                    this._add(control);
                    break;
            }
            return control || super._createChildControlImpl(id);
        }
    }
});