title: How to find QML item by its string id?
body: <p>I have a string <code>id</code> of an object I need to find in QML tree. 
  For example:</p>
  
  <pre><code>var idToFind = "myBtnId"
  </code></pre>
  
  <p>Can I do something like the following?</p>
  
  <pre><code>var objectThatINeed = myMainWindow.findObjectById(idToFind)
  </code></pre>
  
  <p>As far as I understand I can use <code>objectName</code> for this purpose (at least from C++). Can I still reuse existing <code>id</code>s somehow without introducing the names?</p>
  
  <p>I want to use this object as a parent for some other dynamically created controls.</p>