Transparent STATIC text changing - c++

Question

I have this STATIC control displayed over a window that has an image as its background. When I initiate the control it displays a text. If I want to change the text inside a WM_TIMER message it is displayed over the initial text (it is not removed) I have tried UpdateWindow and InvalidateRect but id doesn't work.
This is my code
WM_CREATE:
HWND control = CreateWindowEx(
WS_EX_TRANSPARENT,
L"STATIC",
L"FirstText",
WS_CHILD|WS_VISIBLE|ES_LEFT,
0,
0,
200,
20,
hWnd,
HMENU(LABEL1),
Instance,
NULL
);
break;
case WM_TIMER:
SetWindowText(GetDlgItem(hWnd, LABEL1), L"SecondText");
KillTimer(hWnd, MYTIMER);
// Here I tried UpdateWindow and InvalidateRect but no result
break;
So, the second text is drawn over the first one. It looks like the STATIC content is not updated after changing it. What could be going wrong? Thanks!

Answer 1

I hard coded some numbers in there for testing (like the window ID) - but it's just an example to show you.
case WM_CREATE:
control = CreateWindowEx(
WS_EX_TRANSPARENT,
L"STATIC",
L"FirstText",
WS_CHILD|WS_VISIBLE|ES_LEFT,
0,
0,
200,
20,
hWnd,
HMENU(99),
hInst,
NULL
);
//Create a timer
SetTimer(hWnd,23, 5000,NULL);
break;
case WM_CTLCOLORSTATIC:
if ( GetDlgItem(hWnd, 99) == (HWND)lParam)
{
SetBkMode( (HDC)wParam, TRANSPARENT);
return (LRESULT) GetStockObject(HOLLOW_BRUSH);
}
break;
case WM_TIMER:
{
SetWindowText(GetDlgItem(hWnd, 99), L"Second Text");
KillTimer(hWnd, 23);
RECT rect = {0,0, 200,20};
InvalidateRect(hWnd, &rect, TRUE);
UpdateWindow(hWnd);
}
break;
case WM_PAINT:
{
hdc = BeginPaint(hWnd, &ps);
//Load my test bitmap from resources
HBITMAP hb = LoadBitmap(hInst, MAKEINTRESOURCE(IDB_BITMAP1));
BITMAP bm;
GetObject(hb, sizeof(BITMAP), &bm);
HDC memDC= CreateCompatibleDC(hdc);
SelectObject(memDC,hb);
// ========================
//Put the bitmap on the main window to act as a backdrop
BitBlt(hdc, 0,0, bm.bmWidth,bm.bmHeight,memDC,0,0, SRCCOPY);
DeleteDC(memDC);
EndPaint(hWnd, &ps);
}
break;