--- a/ui/win32/window.c Wed Oct 08 15:54:33 2025 +0200 +++ b/ui/win32/window.c Wed Oct 08 16:09:54 2025 +0200 @@ -103,13 +103,12 @@ UpdateWindow(hwnd); - // TODO: switch to box container - UiContainerX *container = ui_grid_container_create(obj, hwnd, 0, 0, INSETS_ZERO); + UiContainerX *container = ui_box_container_create(obj, hwnd, UI_BOX_VERTICAL, 0, INSETS_ZERO); uic_object_push_container(obj, container); UiWindow *widget = w32_widget_create(&w32_toplevel_widget_class, hwnd, sizeof(UiWindow)); widget->obj = obj; - widget->container = (UiGridLayoutContainer *)container; + widget->container = (UiBoxContainer *)container; obj->widget = (W32Widget*)widget; obj->ref = 1;