let Button = React.createClass({

  _onClick: function(e){

    e.preventDefault();

    this.props.onClick(e, this)

  },

  getSomeAttr: function(){

    return this.props.someAttr;

  },

  render : function() {

    return (

      <button onClick={this._onClick}>

        Send Message

        <span> INSIDE SPAN </span>

        <span className = "sendMsgIcon"> ICON </span>

      </button>

    );

  }

});

​

let MY = React.createClass({

 sendMsg : function(e, btn){

     alert(btn.getSomeAttr());

 },

  render: function() {

    return (

      <Button someAttr="10" onClick={this.sendMsg}/>

    );

  }

});

​

​

ReactDOM.render(

  <MY />,

  document.getElementById("container")

);