var MySlider = React.createClass({ // snip });
var MyAlert = React.createClass({ // snip });
var MyDropdown = React.createClass({ // snip });

React.renderComponent(
    <MySlider />,
    document.getElementById('content')
);

var Namespace = {};
Namespace.MySlider = React.createClass({ // snip });

React.renderComponent(
    <Namespace.MySlider />, // component is not found
    document.getElementById('content')
);

React.renderComponent(
    Namespace.MySlider(),
    document.getElementById('content')
);