Ongoing tooltip in button

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MFC

C++14

I have a big button and I have a tip for this button:
I wrote:

	m_tip.Create(this);

	m_tip.AddTool(GetDlgItem(IDC_BUTTON4), _T("Tooltip text"));
	m_tip.Activate(TRUE);

	

	m_btn1.InitDraw();

	
	

	return TRUE;

	
}


BOOL CMFCApplication22Dlg::PreTranslateMessage(MSG* pMsg)
{
	m_tip.RelayEvent(pMsg);
	return CDialog::PreTranslateMessage(pMsg);
}

now I want that the tip follow mouse when I move inside button, but I don't know how I must do

What I have tried:

I tried with code that I wrote but it doesn't work