(VISTA) Attempting to auto-complete a base class type in the class interface causes Creator to hang

#include <QGraphicsItem>
#include <QPersistentModelIndex>

class GraphicsAdaptor;

struct AdaptorItemInterface : public QGraphicsItem
{
	AdaptorItemInterface() :
		m_gfxAdaptor(0)
	{}

	void setGfxAdaptor(GraphicsAdaptor *gfxAdaptor)		{ m_gfxAdaptor = gfxAdaptor; }
	void setPersistantIndex(QPersistentModelIndex index)	{ m_persistantIndex = index; }
	QPersistentModelIndex persistantIndex() const			{ return m_persistantIndex; }
protected:
	GraphicsAdaptor *m_gfxAdaptor;
	QPersistentModelIndex m_persistantIndex;
};