I tried it to load in a loader and all samples below work!

Qt Code: 
  1. Loader {
  2.             width: 500;
  3.             height: 500;
  4.             source: "qrc:///qml/components/LabelStringEdit.qml";
  5.         }
  6.  
  7. Loader {
  8.             width: 500;
  9.             height: 500;
  10.             source: "qrc:/qml/components/LabelStringEdit.qml";
  11.         }
To copy to clipboard, switch view to plain text mode 

The error i get:
Debug Error
File: global\qglobal.cpp
Line: 2966
ASSERT: "e" in file ...qqmlengine_p.h line 378

With the QMLSCENE it does not work because i do have an Import in my LabelStringEdit.qml
Qt Code: 
  1. import "qrc:/qml/components" as Controls
To copy to clipboard, switch view to plain text mode 
ans of course qmlscene cant find "qrc:/qml/components" but my app should find?! Do i have to provide the Import path to the "QQmlComponent" class?