title: QObject::findChildren() for QML object finding
body: <p>I have an QML form with <code>QQuickApplicationWindow</code>. I need to get <code>QQuickItem</code> pointers on <code>BaseKey</code> elements of QtVirtualKeyboard (it's implementation is placed in separate QML file and loads with Loader of layout when program executes), but it has dynamical (runtime) type like this BaseKey_QMLTYPE_XX, where "XX" is a changeable number. </p>
  
  <p>I found <code>QObject::findChildren()</code> function <a href="http://doc.qt.io/qt-4.8/qobject.html#findChild" rel="nofollow noreferrer">http://doc.qt.io/qt-4.8/qobject.html#findChild</a>, but i cant find out number "XX" in typename. </p>
  
  <p>How can i find QQuickItem pointer on BaseKey from C++ code?</p>