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LRESULT CALLBACK TreeviewWndProc(HWND hwnd, UINT message, WPARAM wparam, LPARAM lparam)
{
  MyTreeview *TV=(MyTreeview *)GetWindowLong(hwnd,GWL_USERDATA);
  return TV->MyWndProc(hwnd, message, wparam, lparam);
}


MyTreeview::MyTreeview(HINSTANCE hInstance, HWND hwndParent)  //constructor
{
...
    SetWindowLong(this->hwnd,GWL_USERDATA,(int)this);
    wndProcOrig=(WNDPROC)SetWindowLong(this->hwnd,GWL_WNDPROC,(int)TreeviewWndProc);
}

LRESULT MyTreeview::MyWndProc(HWND hwnd, UINT message, WPARAM wparam, LPARAM lparam)
{
  // char c[10];
  // sprintf(c,"%d",message);
  // OutputDebugString(c);
  switch(message)
  {
    case WM_LBUTTONDBLCLK:{DoDblClick();};break;
    case WM_NOTIFY:
    {
    /*
      //LPNM_TREEVIEW lpn = (LPNM_TREEVIEW)lparam;   

      switch(((LPNMHDR)lparam)->code)
      {
        case NM_CLICK:
        {MessageBox(hwnd,"NM_Click","Test",0);};break;
        case NM_DBLCLK:
        {DoDblClick();};break;
        // case NM_RCLICK:
        // {};break;
      }*/
      NM_TREEVIEW *pNm;
      pNm=(NM_TREEVIEW *) lparam;
      switch (pNm->hdr.code)
      {
        case NM_CLICK:
          MessageBox(hwnd,"This is Tree control click","something",MB_OK);
        break; 
        case TVN_SELCHANGED:
          char text[128]; // this is the buffer
          pNm->itemNew.mask |= TVIF_TEXT;
          pNm->itemNew.pszText = text;
          TreeView_GetItem( pNm->hdr.hwndFrom, &pNm->itemNew );
          MessageBox(hwnd,text,NULL,MB_OK);
        break;
      }
    };break;
  }
  return CallWindowProc( wndProcOrig, hwnd, message, wparam,lparam); 
}                    

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  case WM_NOTIFY:
  {
    SendMessage(((LPNMHDR)lparam)->hwndFrom,WM_NOTIFY,wparam,lparam);
  };break;