How to implement mouse hover/leave message on system tray.

// TrayPosDemoDlg.h : header file
//

#if !defined(AFX_TRAYPOSDEMODLG_H__D2FD3DCD_5FF9_4B00_B226_27BF9C888FE4__INCLUDED_)
#define AFX_TRAYPOSDEMODLG_H__D2FD3DCD_5FF9_4B00_B226_27BF9C888FE4__INCLUDED_

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000

/////////////////////////////////////////////////////////////////////////////
// CTrayPosDemoDlg dialog

#include "traypos.h"
#include "bmpdlg.h"

#define WM_TRAYNOTIFY (WM_USER+123)

class CTrayPosDemoDlg : public CDialog
{
// Construction
public:
	CTrayPosDemoDlg(CWnd* pParent = NULL);	// standard constructor

// Dialog Data
	//{{AFX_DATA(CTrayPosDemoDlg)
	enum { IDD = IDD_TRAYPOSDEMO_DIALOG };
		// NOTE: the ClassWizard will add data members here
	//}}AFX_DATA

	// ClassWizard generated virtual function overrides
	//{{AFX_VIRTUAL(CTrayPosDemoDlg)
	protected:
	virtual void DoDataExchange(CDataExchange* pDX);	// DDX/DDV support
	//}}AFX_VIRTUAL

private:
	CMsgTrayPos	m_traypos;
	CBmpDlg		m_dlg;


// Implementation
protected:
	HICON m_hIcon;

	// Generated message map functions
	//{{AFX_MSG(CTrayPosDemoDlg)
	virtual BOOL OnInitDialog();
	afx_msg void OnPaint();
	afx_msg HCURSOR OnQueryDragIcon();
	afx_msg void OnDestroy();
	//}}AFX_MSG
	afx_msg LONG OnTrayNotify(WPARAM wParam, LPARAM lParam);
	DECLARE_MESSAGE_MAP()
};

//{{AFX_INSERT_LOCATION}}
// Microsoft Visual C++ will insert additional declarations immediately before the previous line.

#endif // !defined(AFX_TRAYPOSDEMODLG_H__D2FD3DCD_5FF9_4B00_B226_27BF9C888FE4__INCLUDED_)