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0001 Problem: 
0002 
0003 QtDesigner does not render component imported from custom module if it imports some custom module.
0004 
0005 Explanation:
0006 
0007 This problem is described in Qt documentation; section "Using QML Modules with Plugins".
0008 
0009 "Qt Quick Designer uses a QML emulation layer (also called QML Puppet) to render and preview images and to collect data. To be able to render custom types correctly from QML modules, the emulation layer must be built with the same Qt version as the QML modules.
0010 
0011 By default, a fallback emulation layer is provided by Qt Creator and built with the same Qt version as Qt Creator. Therefore, your QML modules will mostly not work out of the box."
0012 
0013 Solution:
0014 
0015 Uncheck "Always use the QML emulation layer provided by QtCreator" in Tools > Options > Qt Quick > Qt Quick Designer.