C / C++ / MFC

//{{AFX_MSG(CMyDlg)
afx_msg BOOL OnEraseBkgnd(CDC* pDC);
virtual BOOL OnInitDialog();
afx_msg void OnPaint();
//}}AFX_MSG

//{{AFX_MSG_MAP(CMyDlg)
ON_WM_ERASEBKGND()
ON_WM_PAINT()
//}}AFX_MSG_MAP

void CMyDlg::OnPaint() 
{
        CPaintDC dc(this); // device context for painting
	
        // Kein Aufruf von CDialog::OnPaint() für Zeichnungsnachrichten
}

CWnd
 A     
 |    
 |   
MyTab

class MyTab : protected CWnd {
public:
   void add(const CString& title, CDialog* dlg);
   ...
protected:
   ...
private:
   ...
};

CWnd  ITab (abstract class as interface)
 A     A
 |    /
 |   /
MyTab

class ITab {
public:
   virtual void add(const CString& title, CDialog* dlg)=0;
};

class MyTab : public ITab, protected CWnd {
public:
   virtual void add(const CString& title, CDialog* dlg);
   ...
protected:
   ...
private:
   ...
};