I've got classes set up like so (where an indent is inherits from):
Qt Code: 
  1. Wizzy
  2.     BranchWizzy
  3.     InputWizzy
  4.     LoopWizzy
  5.     NamedWizzy
  6.           DatumWizzy
  7.           ProcedureWizzy 
  8.     OutputWizzy
  9.     SinkWizzy
  10.     SourceWizzy
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The problem is that when I try to include and use any class at the same level (e.g. Have an OutputWizzy create a BranchWizzy) it won't compile and gives the following message when trying to instantiate a BranchWizzy:
Qt Code: 
  1. OutputWizzy.cpp: In constructor `OutputWizzy::OutputWizzy(QObject*)':
  2. OutputWizzy.cpp:9: error: `b' undeclared (first use this function)
  3. OutputWizzy.cpp:9: error: (Each undeclared identifier is reported only once for each function it appears in.)
  4. OutputWizzy.cpp:9: error: `BranchWizzy' is not a type
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I'm using Qt 4.4.3 and mingw on Windows XP.
Everything compiles fine if I don't have a Wizzy subclass try to use any other Wizzy subclass.

Here's a snip of the Wizzy.h:
Qt Code: 
  1. #ifndef WIZZY_H
  2. #define WIZZY_H
  3.  
  4. #include "Property.h"
  5. #include <QtGui>
  6.  
  7. class WizzyConnectionPoint;
  8.  
  9. class Wizzy : public QObject, public QGraphicsPixmapItem
  10. {
  11.    Q_OBJECT
  12.  
  13.    public:
  14.       Wizzy( QObject* = NULL );
  15.       ~Wizzy();
  16. /* snip */
  17. };
  18. #endif
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The Wizzy subclasses inherit the Wizzy class in a similar manner. I am simply out of ideas of why one subclass "can't see" another.

Any ideas? I can post any other code anyone would like to see. Thanks!