title: When i try to make a notification with winrt, it makes an error
body: <p>I am trying to make winRT send notifications.
  I tried doing this to make a notification:</p>
  <pre><code>import winrt.windows.ui.notifications as notifications
  import winrt.windows.data.xml.dom as dom
  
  #create notifier
  nManager = notifications.ToastNotificationManager
  notifier = nManager.create_toast_notifier();
  
  #define your notification as string
  tString = &quot;&quot;&quot;
  &lt;toast&gt;
      &lt;visual&gt;
          &lt;binding template='ToastGeneric'&gt;
              &lt;text&gt;Sample toast&lt;/text&gt;
              &lt;text&gt;Sample content&lt;/text&gt;
          &lt;/binding&gt;
      &lt;/visual&gt;
  &lt;/toast&gt;
  &quot;&quot;&quot;
  
  #convert notification to an XmlDocument
  xDoc = dom.XmlDocument()
  xDoc.load_xml(tString)
  
  #display notification
  notifier.show(notifications.ToastNotification(xDoc))
  </code></pre>
  <p>Hoever, it returns this error, when i try to run it.</p>
  <pre><code>    notifier = notifications.ToastNotificationManager.create_toast_notifier()
  RuntimeError: Element not found.
  </code></pre>
  <p>My system meets the requierments of winrt</p>
  <pre><code>Windows 10, October 2018 Update or later.
  Python for Windows, version 3.7 or later
  pip, version 19 or later
  </code></pre>
  <p>How do i fix this error? I can not use other modules, because winrt is the olny one (that I know of) where you can create ui elements on the notification such as buttons.</p>