Win32 GUI flickering on resize

I have a Win32 GUI program with a tab control, each tab having a list view control. There is massive flickering whenever the window is resized. I've tried the following things: - Handling WM_ERASEBKGND in the main wndproc and returning TRUE. No effect. - Filtering out all WM_ERASEBKGND messages in the event loop. No effect. - Setting the WM_CLIPCHILDREN style on the main window. Now when the window is resized the list view control is simply erased to a white background and doesn't redraw. - Using DefWindowPos instead of MoveWindow. No effect. - Passing FALSE for bRepaint in MoveWindow. Same effect as setting WS_CLIPCHILDREN (see above). Here's the RegisterClassEx code: ``` memset(&wcex, 0, sizeof(WNDCLASSEX)); wcex.cbSize = sizeof(WNDCLASSEX); wcex.style = 0; wcex.lpfnWndProc = PhMainWndProc; wcex.cbClsExtra = 0; wcex.cbWndExtra = 0; wcex.hInstance = PhInstanceHandle; wcex.hIcon = LoadIcon(PhInstanceHandle, MAKEINTRESOURCE(IDI_PROCESSHACKER)); wcex.hCursor = LoadCursor(NULL, IDC_ARROW); //wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1); wcex.lpszMenuName = MAKEINTRESOURCE(IDR_MAINWND); wcex.lpszClassName = PhWindowClassName; wcex.hIconSm = (HICON)LoadImage(PhInstanceHandle, MAKEINTRESOURCE(IDI_PROCESSHACKER), IMAGE_ICON, 16, 16, 0); ``` The WM_SIZE handler: ``` RECT rect; // Resize the tab control. GetClientRect(PhMainWndHandle, &rect); MoveWindow(TabControlHandle, rect.left, rect.top, rect.right - rect.left, rect.bottom - rect.top, TRUE); // Resize the list view. TabCtrl_AdjustRect(TabControlHandle, FALSE, &rect); MoveWindow(ListViewHandle, rect.left, rect.top, rect.right - rect.left, rect.bottom - rect.top, TRUE); ``` The styles are as follows: - Main window: `WS_OVERLAPPEDWINDOW` - Tab control: `WS_CHILD` (and `WS_VISIBLE`) - List view control: `WS_CHILD | WS_BORDER | LVS_REPORT` (and `WS_VISIBLE`)