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2m��  ��:m VC FAQ(5)
2m����վ:m '3m�Ͻ�ɺ�m' (Wed Apr  8 08:13:51 1998) , 5mվ���ż�m

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  _____________________________________________________  
  How subclass the listbox portion of a combobox? 
  _____________________________________________________ 

  The listbox portion of a combobox is of type COMBOLBOX  ( notice the 
'L'). 
Because the ComboLBox window is not a child of the ComboBox window, it is 
not obvious how to subclass the COMBOLBOX control.  Luckily, under the 
Win32 
API, Windows sends a message to the COMBOBOX ( notice no 'L') called 
WM_CTLCOLORLISTBOX before the listbox is drawn. The lParam passed with this

message contains the handle of the listbox. For example: 

LRESULT CFileUpdateCombo::OnCtlColorListBox(WPARAM wParam,  

LPARAM lParam)  

{ 

        if ( ! m_bSubclassedListBox )  

{ 

                        HWND hWnd = (HWND)lParam; 

                        CWnd* pWnd = FromHandle(hWnd); 

                        if ( pWnd && pWnd != this ) 

                        { 

                                // m_ListBox is derived from CListBox 

                                m_ListBox.SubclassWindow(hWnd ); 

                                m_ListBox.SetOwner(this);  

                                m_bSubclassedListBox = TRUE; 

                        } 

        } 

        return (LRESULT)GetStockObject(WHITE_BRUSH); 

} 


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