EnumChildWindows(hWnd, SetChildRedraw, FALSE); //stopping redraw
//... here you do your operations
EnumChildWindows(hWnd, SetChildRedraw, TRUE); //restarting redraw

#define DECLARE_STRING(str) TCHAR str[MAX_PATH]; ZeroMemory(str, sizeof(str));
BOOL CALLBACK SetChildRedraw(HWND hwndChild, LPARAM lParam)
{
    RECT rcChildRect; ZeroMemory(&rcChildRect, sizeof(rcChildRect));
    DECLARE_STRING(sText)
    GetClassName(hwndChild, sText, MAX_PATH);
    if (wcsstr(sText, L"SysTreeView32") != NULL)
    {
        SetWindowRedraw(hwndChild, lParam);
        if (lParam == TRUE)
        {
            GetWindowRect(hwndChild, &rcChildRect);
            InvalidateRect(hwndChild, &rcChildRect, TRUE);
        }
    }
    return TRUE;
}