onmouseover not working with React.js : <p>The click event works fine, but the onmouseover event does not work.  </p>

<pre><code>ProfImage = React.createClass({

    getInitialState: function() {
        return { showIcons: false };
    },

    onClick: function() {

        if(this.state.showIcons == true) {
            this.setState({ showIcons: false });
        }
        else {
            this.setState({ showIcons: true });
        }
    },

    onHover: function() {
        this.setState({ showIcons: true });
    },

    render: function() {

        return (
            &lt;div&gt;
            &lt;span className="major"&gt;
                &lt;img src="/images/profile-pic.png" height="100" onClick={this.onClick} onmouseover={this.onHover} /&gt;
            &lt;/span&gt;


            { this.state.showIcons ? &lt;SocialIcons /&gt; : null }
            &lt;/div&gt;

        );
    }

});
</code></pre>
