<ul class="contains-task-list">
<li class="task-list-item"><input type="checkbox" id="" disabled="" class="task-list-item-checkbox" checked=""> I have searched the <a href="https://github.com/mui-org/material-ui/issues">issues</a> of this repository and believe that this is not a duplicate.</li>
</ul>
<h2 dir="auto">Expected Behavior</h2>
<p dir="auto">A way to add custom classes to the Hidden "div" tag.</p>

<h2 dir="auto">Current Behavior</h2>
<p dir="auto">Unable to add custom classes to the generated div.</p>
<h2 dir="auto">Context</h2>
<p dir="auto">Trying to add an Hidden in a Toolbar.</p>

<h2 dir="auto">Your Environment</h2>

<table role="table">
<thead>
<tr>
<th>Tech</th>
<th>Version</th>
</tr>
</thead>
<tbody>
<tr>
<td>Material-UI</td>
<td>beta-31</td>
</tr>
<tr>
<td>React</td>
<td>latest</td>
</tr>
<tr>
<td>browser</td>
<td>chrome</td>
</tr>
</tbody>
</table>
<ul dir="auto">
<li>[x ] I have searched the <a href="https://github.com/mui-org/material-ui/issues">issues</a> of this repository and believe that this is not a duplicate.</li>
</ul>
<h2 dir="auto">Expected Behavior</h2>
<p dir="auto">Specifying a tabindex of -1 should make it so that the control does not receive focus when using the tab key.</p>
<h2 dir="auto">Current Behavior</h2>
<p dir="auto">TextField and Select still receive focus when a tabindex of -1 is specified.  I haven't tested other controls but they may also be affected.</p>
<h2 dir="auto">Steps to Reproduce (for bugs)</h2>
<p dir="auto">See here: <a href="https://codesandbox.io/s/l24mx1240q" rel="nofollow">https://codesandbox.io/s/l24mx1240q</a></p>
<ol dir="auto">
<li>Click on the compiled window.</li>
<li>Press the tab key</li>
<li>Both the TextField and Select receive focus.</li>
</ol>