<p dir="auto">The typescript definition file for the Popover component is missing both the anchorPosition and anchorReference props added in <a class="issue-link js-issue-link" data-error-text="Failed to load title" data-id="271375200" data-permission-text="Title is private" data-url="https://github.com/mui/material-ui/issues/9004" data-hovercard-type="pull_request" data-hovercard-url="/mui/material-ui/pull/9004/hovercard" href="https://github.com/mui/material-ui/pull/9004">#9004</a> . I believe (though I'm not familiar with Flow) the Flow types are there in the .js component file.</p>


<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">Popover in Typescript projects should be able to have anchorPosition and anchorReference set.</p>
<h2 dir="auto">Current Behavior</h2>

<p dir="auto">Typescript throws the following errors:</p>
<blockquote>
<p dir="auto">TS2339: Property 'anchorPosition' does not exist on type 'IntrinsicAttributes &amp; PopoverProps &amp; { children?: ReactNode; }'.<br>
TS2339: Property 'anchorReference' does not exist on type 'IntrinsicAttributes &amp; PopoverProps &amp; { children?: ReactNode; }'.</p>
</blockquote>
<h2 dir="auto">Steps to Reproduce (for bugs)</h2>

<ol dir="auto">
<li>Add anchorPosition and anchorReference to Popover</li>
<li>Compile code with Typescript</li>
</ol>
<h2 dir="auto">Context</h2>

<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>1.0.0-beta.22</td>
</tr>
<tr>
<td>React</td>
<td>16.1.1</td>
</tr>
<tr>
<td>browser</td>
<td>N/A</td>
</tr>
<tr>
<td>typescript</td>
<td>2.6.1</td>
</tr>
</tbody>
</table>
<p dir="auto"><a href="https://material-ui-1dab0.firebaseapp.com/demos/selects/" rel="nofollow">https://material-ui-1dab0.firebaseapp.com/demos/selects/</a><br>
as this demo show, when I click a selected menu item and move out, the background not changed</p>