I need help creating a tooltip for a control in a non MFC dialog.

[vtothau]

Like the title says, I'm having issues creating a tooltip for one of my controls in my dialog. This is what I have:

HWND CreateToolTip(int toolID, HWND hDlg, PTSTR pszText)
{
    if (!toolID || !hDlg || !pszText)
    {
        return FALSE;
    }
    // Get the window of the tool.
    HWND hwndTool = GetDlgItem(hDlg, toolID);
    
    HINSTANCE hMod = (HINSTANCE)GetWindowLong(hDlg,GWL_HINSTANCE);

    // Create the tooltip. g_hInst is the global instance handle.
    HWND hwndTip = CreateWindowEx(NULL, TOOLTIPS_CLASS, NULL,
                              WS_POPUP |TTS_ALWAYSTIP | TTS_BALLOON,
                              CW_USEDEFAULT, CW_USEDEFAULT,
                              CW_USEDEFAULT, CW_USEDEFAULT,
                              hDlg, NULL, 
                              hMod, NULL);
    
   if (!hwndTool || !hwndTip)
   {
       return (HWND)NULL;
   }                              
                              
    // Associate the tooltip with the tool.
    TOOLINFO toolInfo = { 0 };
    toolInfo.cbSize = sizeof(toolInfo);
    toolInfo.hwnd = hDlg;
    toolInfo.uFlags = TTF_IDISHWND | TTF_SUBCLASS;
    toolInfo.uId = (UINT_PTR)hwndTool;
    toolInfo.lpszText = pszText;
    SendMessage(hwndTip, TTM_ADDTOOL, 0, (LPARAM)&toolInfo);

    return hwndTip;
}

I called this function from WM_INITDIALOG

testToolTip = CreateToolTip(IDC_CHECK1, hWnd, "Test");

My problem is, I can't get this tooltip to show. I've tried using this:

SendMessage(testToolTip , TTM_ACTIVATE, 0, 0);

It never shows up for me. Can someone tell me what the problem is?