MFC Member Callbacks

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MFC

I've been away from MFC for way too long and have a newbie question regarding callbacks.

I'm trying to make a variation of the CListCtrl listbox that asks if a line is valid, then turns the line red if it isn't. A callback or function pointer would be perfect, but I'm having trouble making it work.

This is basically what I'm trying to do:

class CListCtrl2 : public CListCtrl
{
public:
    bool (*DataIsValidCheck)(void *data);     // a remote function 
protected:
    void DrawItem(void *data);
}
void CListCtrl2::DrawItem(void *data)
{
    bool showNormal=false;
    if(DataIsValidCheck!=NULL)                // if its set, then call it
       showNormal=DataIsValidCheck(data);
    if(showNormal)
       textcolor=black;
    else
       textcolor=red;
    ...
}

class MyWindow : public CDialog
{
public:
    bool CheckItemValidity(void *data);       // parent window with ability to validate item
protected:
    CListCtrl2	ListCtrl;                     // the list control 
}
MyWindow::MyWindow()
{
    ListCtrl2.DataIsValidCheck = this->CheckItemValidity;
}
bool MyWindow::CheckItemValidity(void *itemData)
{
   if(...)
      return true;
   else
      return false;
}

What is the right way to do this call in MFC C++?
Thanks for any help!