Habe Grafik- Klasse (CWnd) Objekt mit in dem ich meine Grafik mal:

class CWorkflowGraphic : public CWnd{

public:
	CMyVisDiagramm *m_Graphic;
	CWorkflow *m_Workflow;

	CWorkflowGraphic(CWnd *m_Hw,CRect &m_rc,CWorkflow *m) : CWnd(){

		m_Workflow=m;
	   Create(_T("STATIC"), "Hi", WS_CHILD | WS_VISIBLE,m_rc, m_Hw, 1234);

            //Grafik erzeugen und dne CDC des CWnd verwenden!
	   m_Graphic= new CMyVisDiagramm(this->GetWindowDC(),	
				CPoint(1,1),
				m_rc.right-m_rc.left-1,
				m_rc.bottom-m_rc.top-1);

	   m_Graphic->getData(m_Workflow);
	}

	virtual ~CWorkflowGraphic(){ 
		if(m_Graphic)
			delete m_Graphic; 
	}

	//void Invalidate();

	inline CMyVisDiagramm* getGraphic(){
		return m_Graphic;
	}
	//inline virtual BOOL Create() : Create( 

};

Hier strützt das Programm ab:

BOOL CGdiObject::DeleteObject()
{
	if (m_hObject == NULL)
		return FALSE;
	return ::DeleteObject(Detach());
}