var div = React.DOM.div
var h1 = React.DOM.h1

var MyTitle = React.createClass({
  render () {
    return (
      div(null,
        h1(null, 'Check out my first class component!')
      )
    )
  }
})

var MyFirstComponent = (
  div(null,
    React.createElement(MyTitle, null)
  )
)

ReactDOM.render(MyFirstComponent, document.getElementById('app'))

var div = React.DOM.div
var h1 = React.DOM.h1

var MyTitle = React.createClass({
  render () {
    return (
      div(null,
        h1(null, 'Check out my first class component!')
      )
    )
  }
})

var MyTitleFact = React.createFactory(MyTitle)

var MyFirstComponent = (
  div(null,
    MyTitleFact(null),
    React.createElement(MyTitle, null)
  )
)

ReactDOM.render(MyFirstComponent, document.getElementById('app'))

Use factory technique for rendering component