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Hi Folks;
My problem is, that I do not get notified by an Tree-Control inserted into an CExtTabPageContainerFlatWnd.

I subclassed from CExtTabPageContainerFlatWnd and inserted an CTreeCtrl into the TabPageContainer. I expect WM_NOTIFY messages to be sent to MyTabWnd, which ist parent of the TreeCtrl. How do I catch the WM_NOTIFY Message that should be sent by the TreeCtrl when the selection changed?

For clarification(?), here are some code-fragments:

CMyTabWnd : public CExtTabPageContainerFlatWnd
{
public:
  Create(CWnd* pParent);
public: 
 CTreeCtrl m_TreeCtrl;
}

CMyTabWnd::Create(CWnd* pParent)
{
 CExtTabPageContainerFlatWnd::Create(pParent);
 
 if( !m_TreeCtrl.Create(
  WS_CHILD|WS_VISIBLE|WS_VSCROLL|WS_HSCROLL|WS_TABSTOP
  |TVS_HASBUTTONS|TVS_HASLINES|TVS_LINESATROOT
  |TVS_INFOTIP|TVS_DISABLEDRAGDROP
  |TVS_SINGLEEXPAND|TVS_SHOWSELALWAYS
  , CRect(0,0,0,0), this, UINT(IDC_STATIC) )
  )
 {
  TRACE0("Failed to create TreeCtrl\n");
  return FALSE;  // fail to create
 }
 m_TreeCtrl.SetFont( CFont::FromHandle( (HFONT)::GetStockObject(DEFAULT_GUI_FONT))

 VERIFY( PageInsert( &m_TreeCtrl, _T("Tree")  ) );

 return TRUE;
}

I tried to overwrite CMyTabWnd::OnNotify(...) but it was never called - overwriting OnHookNotifyMsg(...) did not work either.

Thanks for your help.
Joachim

The internal implementation of the CExtTabPageContainerWnd class changes identifiers of the windows which you insert as its pages. So, you cannot use the ON_NOTIFY macros directly. For example, if you created a tree control specified with IDC_STATIC, this macros does not work:

BEGIN_MESSAGE_MAP(CMyTabPageContainerWnd, CExtTabPageContainerWnd)
      //{{AFX_MSG_MAP(CMyTabPageContainerWnd)
      ON_NOTIFY(TVN_SELCHANGED, IDC_STATIC, OnSelchangedTree1)
      //}}AFX_MSG_MAP
END_MESSAGE_MAP()

class CMyTabPageContainerWnd : public CExtTabPageContainerWnd
{
      // Overrides
      // ClassWizard generated virtual function overrides
      //{{AFX_VIRTUAL(CMyTabPageContainerWnd)
      protected:
      virtual BOOL OnNotify(WPARAM wParam, 
      LPARAM lParam, LRESULT* pResult);
      //}}AFX_VIRTUAL
 
      // Implementation
      protected:
      // Generated message map functions
      //{{AFX_MSG(CMyTabPageContainerWnd)
      //}}AFX_MSG
      DECLARE_MESSAGE_MAP()
}; // class CMyTabPageContainerWnd
 
 
BOOL CMyTabPageContainerWnd::OnNotify(WPARAM wParam, LPARAM lParam, LRESULT* pResult) 
{
      ASSERT(pResult != NULL);
      NMHDR* pNMHDR = (NMHDR*)lParam;
      HWND hWndCtrl = pNMHDR->hwndFrom;
 
      // get the child ID from the window itself
      UINT nID = ((UINT)(WORD)::GetDlgCtrlID( hWndCtrl ));
      UINT nIDTree = ((UINT)(WORD)::GetDlgCtrlID( m_TreeCtrl.m_hWnd ));
      int nCode = pNMHDR->code;
 
      ASSERT(hWndCtrl != NULL);
      ASSERT(::IsWindow(hWndCtrl));
 
      if( nCode == TVN_SELCHANGED && nID == nIDTree )
      {
            ...
            return;
      }
 
      return CExtTabPageContainerWnd::OnNotify(wParam, lParam, pResult);
}