title: PropTypes validators directly is not supported from `TreeView`, `ObjectInspector`, `ConnectedTreeNode`, `ObjectRootLabel`, `ObjectPreview`
body: <p>I'm getting this <code>PropTypes validators directly is not supported</code> warning for these components <code>TreeView</code>, <code>ObjectInspector</code>, <code>ConnectedTreeNode</code>, <code>ObjectRootLabel</code>, <code>ObjectPreview</code>, but I don't know what library these components belong to.</p>
  
  <p>How can I get rid of these warnings?</p>
  
  <pre><code>Warning: Failed Context Types: Calling PropTypes validators directly is not supported by the `prop-types` package. Use `PropTypes.checkPropTypes()` to call them. Check the render method of `TreeView`.
  Warning: Failed Context Types: Calling PropTypes validators directly is not supported by the `prop-types` package. Use `PropTypes.checkPropTypes()` to call them. Check the render method of `ObjectInspector`.
  Warning: Failed Context Types: Calling PropTypes validators directly is not supported by the `prop-types` package. Use `PropTypes.checkPropTypes()` to call them. Check the render method of `ConnectedTreeNode`.
  Warning: Failed Context Types: Calling PropTypes validators directly is not supported by the `prop-types` package. Use `PropTypes.checkPropTypes()` to call them. Check the render method of `ObjectRootLabel`.
  Warning: Failed Context Types: Calling PropTypes validators directly is not supported by the `prop-types` package. Use `PropTypes.checkPropTypes()` to call them. Check the render method of `ObjectPreview`.
  </code></pre>