Get propery of other React component in a library - reactjs

Question

I'm writing a library full of ReactJS components, so Flux should not be used, since it's a library.
I have a component, a ThemeProvider.
import React from 'react';
class OfficeUIThemeProvider extends React.Component {
constructor(props) {
super(props);
}
render() {
return null;
}
}
OfficeUIThemeProvider.propTypes = {
theme: React.PropTypes.oneOf(['Office2016']).isRequired,
color: React.PropTypes.oneOf(['Light-Blue', 'Blue', 'Green', 'Orange', 'Purple', 'Red']).isRequired
};
export default OfficeUIThemeProvider;
I return null in the render() method since this component should not render anything.
Then I do have a simple component, a button.
import React from 'react';
class OfficeUIButton extends React.Component {
constructor(props) {
super(props);
}
render() {
return <div className={"officeui-button"}>
<span className="{officeui-button-label}">{this.props.label}</span>
</div>
}
}
OfficeUIButton.propTypes = {
label: React.PropTypes.string.isRequired,
};
export default OfficeUIButton;
Now, I want the button to have specific classes, based on the values provided in the ThemeProvider.
A simple solution would be to render the OfficeUIButton component directly in my ThemeProvider render() method but this is not a valid solution since I'm developing a library and don't want to couple things.
An application using this library should work as:
ReactDOM.render(
<OfficeUIThemeProvider theme='Office2016' color='Light-Blue'>
<OfficeUIButton label="To..." />
</OfficeUIThemeProvider>,
document.getElementById('app')
);
But, this renders nothing since my ThemeProvider return null○ in it'srender` method.
How can this be accomplished?
Kind regards,

Answer 1

OfficeUIButton is child component of OfficeUIThemeProvider, so I suppose you should try:
class OfficeUIThemeProvider extends React.Component {
constructor(props) {
super(props);
}
render() {
return (
<div>
{this.props.children}
</div>
);
}
}