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reactjs - can we attach click handlers to custom child components

I was trying to add a click handler to my own child component. In react chrome extension I was able to see the click handler as well.

But the click itself didn't work - wondering what did I miss.

Sample Code:

... 
render (
  <MySampleComponent onClick={this.handler} />
);
...
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MySampleComponent can take whichever props it wants; components don't automatically copy props to their children. If you want to be able to add an onClick handler to MySampleComponent, then you can support this in the definition of that component:

var MySampleComponent = React.createClass({
  render: function() {
    return <div onClick={this.props.onClick}>...</div>;
  }
});

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