gwt material and uibinder

Hello. 

I'm totally new on gwt and I would like to use gwt material to make my application's UI.

I'm not really confortable with maven, so I downloaded the .jar and imported it in my project. I can so use the component like that :

MaterialButton myButton1 = new MaterialButton();
myButton1.setTextColor("white");
myButton1.setText("myButton1");
myButton1.setType(ButtonType.RAISED);
myButton1.setWaves(WavesType.DEFAULT);

RootPanel.get("divContainer").add(myButton1);

My button is shown in my page and it is perfect. 

But I would like to do the same with uiBinder cause it's a lot more confortable to develop a huge application in my opinion ! 

So I created a myButton2.ui.xml file with this : 

<ui:UiBinder xmlns:ui='urn:ui:com.google.gwt.uibinder'

    xmlns:g='urn:import:com.google.gwt.user.client.ui'

    xmlns:m="urn:import:gwt.material.design.client.ui">

    <m:MaterialButton text="myButton2" waves="DEFAULT" backgroundColor="white" textColor="black"/>

</ui:UiBinder>

And the respective class : 

package com.google.gwt.sample.testGwtMaterial.client;

import com.google.gwt.core.client.GWT;

import com.google.gwt.uibinder.client.UiBinder;

import com.google.gwt.user.client.ui.Composite;

import com.google.gwt.user.client.ui.Widget;

public class myButton2 extends Composite {

interface MyUiBinder extends UiBinder<Widget, HelloWorld> {

}

private static MyUiBinder uiBinder = GWT.create(MyUiBinder.class);

        public myButton2() {
        }
}

But when I change my RootPanel.add thing to :

myButton2 fooBtn = new myButton2();

RootPanel.get("divContainer").add(fooBtn);

There is nothing printed in my page. What I did wrong ?

Thanks for tips !

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