I have a problem using namespaces with promoted classes.

In my company with use a structure where all the namespaces have a relative directory with the same name so,
if a have a project that uses namespace aaa { namespace bbb { namespace ccc,
the files are in <path>/aaa/bbb/ccc

Now, my current project is inside 3 namespaces. In qtcreator I promote a QTableWidget object to my own CTableWidget class.
When I compile, the file CTableWidget.h is found but, as the file uses namespace aaa { namespace bbb { namespace ccc,
the compiler throws and error:
ui_MainWindow.h:50: error: ISO C++ forbids declaration of ‘CTableWidget’ with no type
as ui_MainWindow.h doesn't know that there are namespaces and, of course, I cannot modify it as it's created by qmake.

Is there a solution for this ?

Actually I've solved in this way:
Qt Code: 
  1. using namespace aaa::bbb::ccc;
  2. #include "ui_MainWindow.h"
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but it's ugly