C / C++ / MFC

MyControl : public CWnd
{
    void setText()
    {
        m_MMC.setText();
       Invalidate();
    }

    MMC m_MMC;
}

MyControl : public CWnd, MMC
{
    // figure out how to make CWnd update when a MMC method is called
}

class MMC{
public:
  setText()
  {
     // TODO: Add your code here    
  }
protected:
  virtual void OnRefresh()
  { /* defined in child */ }
};

class ctrlList : public CWnd, MMC{
public:
  void OnHScroll()
  {
    ScrollDC();
    Invalidate(); // Instead of OnRefresh() cuz it's virtual (Better performance???)
  }
  // etc...
protected:
  void OnRefresh(){ invalidate(); }
};

class MyClass
{
...
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