Strange problem with SendMessage and ON_CONTROL

Dear Experts

I'm trying to send my own message to parent window. So I defined message ID and put it into SendMessage function. In Parent window I put ON_CONTROL macro in message map, but it is never called. I use wrapper of ActiveX control (not MFC) and have no idea what is going wrong. I tried with wrapper around standard control (CComboBox) and it works fine. Is the any difference in calling WM_COMMAND for ActiveX wrappers and standard MFC controls?? What is very odd, It sometimes works if I put NULL instead of m_hWnd (as LPARAM) in SendMessage.

//command definition
#define SYSCOMBO_CHANGE 0x1000

//own ON_CONTROL definition
#define ON_SYSCOMBO_CHANGE(_id, _memberFxn) \
  ON_CONTROL(SYSCOMBO_CHANGE, _id, _memberFxn)

//method in which message is sent
void CSysComboEdit::OnItemChange()
{
  GetParent()->SendMessage(WM_COMMAND, MAKEWPARAM(GetDlgCtrlID(), SYSCOMBO_CHANGE), (LPARAM)m_hWnd);
}

//how OnItemChange is called (maight be helpful)
BEGIN_EVENTSINK_MAP(CSysComboEdit, CSysEditBase<_dxPickEdit>)
  ON_EVENT_REFLECT(CSysComboEdit, 1 /* Change */, OnItemChange, VTS_NONE)
END_EVENTSINK_MAP()

//parent dialog message map
BEGIN_MESSAGE_MAP(CLoginDlg, CSysDialog)
      //{{AFX_MSG_MAP(CLoginDlg)
  ON_SYSCOMBO_CHANGE(IDC_TOOLS_COMBO_DATABASE, OnSelchangeComboDatabase)
      //}}AFX_MSG_MAP
      ON_WM_CTLCOLOR()
      ON_WM_ERASEBKGND()
END_MESSAGE_MAP()

//parent dialog method definition
afx_msg void OnSelchangeComboDatabase();

Method OnSelchangeComboDatabase is never called. I'm using VC6 with SP5.

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