Tooltip not getting displayed in mfc

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C++

MFC

Hi Everyone,

I have a child window derived from CMDIChildWndEx named as CTestTooltipMdiChildWnd, on CTestTooltipMdiChildWnd titlebar, I have drawn a custom icon which is intially disabled.
When user mouse over on this custom icon, I should get a tooltip displayed.I get rect value of custom icon as below.

ti.rect = m_CustomIconInfo.m_testBtn;

I tried writting code on OnNcHitTest(CPOINT point) as below. I am not able to see tooltip getting displayed.


Can anybody suggest If I have missed anything in coding.

LRESULT CTestTooltipMdiChildWnd::OnNcHitTest(CPoint point)
{
	HWND hwndTT = CreateWindowEx(NULL, TOOLTIPS_CLASS, NULL, 
                                 WS_POPUP | TTS_NOPREFIX | TTS_ALWAYSTIP, 
                                 CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, 
                                m_hWnd, NULL, GetModuleHandle(0),NULL);
		
	::SendMessage(hwndTT,TTM_ACTIVATE,TRUE,0);

	 TOOLINFO ti = { 0 };
	 ti.cbSize   = sizeof(TOOLINFO);
	 ti.uFlags   = TTF_IDISHWND;
	 ti.hwnd     = m_hWnd;
	 ti.uId    = (UINT)m_hWnd;
	 ti.hinst    = GetModuleHandle(0);
	 ti.rect = m_CustomIconInfo.m_testBtn;
	 ti.lpszText = TEXT("This is your tooltip string.");;
    
	:: SendMessage(hwndTT, TTM_ADDTOOL, 0, (LPARAM) (LPTOOLINFO) &ti); 
	::SendMessage(hwndTT,TTM_TRACKACTIVATE, TRUE, (LPARAM)&ti);
}

Regards,
Joy

What I have tried:

Written Code in OnHitTest(CPoint) as below.

HWND hwndTT = CreateWindowEx(NULL, TOOLTIPS_CLASS, NULL, 
                                 WS_POPUP | TTS_NOPREFIX | TTS_ALWAYSTIP, 
                                 CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, 
                                m_hWnd, NULL, GetModuleHandle(0),NULL);
		
	::SendMessage(hwndTT,TTM_ACTIVATE,TRUE,0);

	 TOOLINFO ti = { 0 };
	 ti.cbSize   = sizeof(TOOLINFO);
	 ti.uFlags   = TTF_IDISHWND;
	 ti.hwnd     = m_hWnd;
	 ti.uId    = (UINT)m_hWnd;
	 ti.hinst    = GetModuleHandle(0);
	 ti.rect = m_CustomCaptionInfo.m_testBtn;
	 ti.lpszText = TEXT("This is your tooltip string.");;
    
	:: SendMessage(hwndTT, TTM_ADDTOOL, 0, (LPARAM) (LPTOOLINFO) &ti); 
	::SendMessage(hwndTT,TTM_TRACKACTIVATE, TRUE, (LPARAM)&ti);