Tool tip goes away and comes back on ListView

Question

I am testing if it is possible to have a tool tip show up on top of a ListView Group Header. The following code works, which is in the subclass procedure for the ListView. The main issue I'm asking about is when I move away from the group header, ie to a list item, the tool tip goes away then comes back until it times out normally.

I also found if I come in right from the start (not on a group header), it pops up again on the call:

SendMessage(info->hToolTip, TTM_TRACKACTIVATE, FALSE, (LPARAM)&info->ToolInfo);

Is there a way to prevent the tool tip from showing up again?

    case WM_MOUSEMOVE: {
            auto info = reinterpret_cast<SubclassInfo*>(dwRefData);
            if (info) {
                // get mouse position
                POINT pt = { LOWORD(lParam), HIWORD(lParam) };

                // total groups
                int groupCount = SendMessage(hWnd, LVM_GETGROUPCOUNT, 0, 0);
                for (int groupId = 1; groupId <= groupCount; ++groupId) {
                    // group header rectangle only
                    RECT grpRect;
                    if (ListView_GetGroupRect(hWnd, groupId, LVGGR_HEADER, &grpRect)) {
                        if (PtInRect(&grpRect, pt)) {
                            // Mouse is over this group's header
                            currentGroupId = groupId;  
                            SendMessage(info->hToolTip, TTM_TRACKPOSITION, 0, MAKELPARAM(pt.x, pt.y));
                            SendMessage(info->hToolTip, TTM_TRACKACTIVATE, TRUE, (LPARAM)&info->ToolInfo);
                            return DefSubclassProc(hWnd, uMsg, wParam, lParam);
                        }
                    }
                }

                // Deactivate tooltip if not over any header
                SendMessage(info->hToolTip, TTM_TRACKACTIVATE, FALSE, (LPARAM)&info->ToolInfo);
            }
            break;
    }