* <code>Widget</code>.
*/
protected static void assertHasWidgetFlowContainer(XmlObjectInfo panel,
boolean forCanvas,
boolean expected) throws Exception {
FlowContainerFactory factory = new FlowContainerFactory(panel, forCanvas);
List<FlowContainer> flowContainers = factory.get();
// check each factory
WidgetInfo button = createButton();
boolean valid = false;
for (FlowContainer flowContainer : flowContainers) {
valid |= flowContainer.validateComponent(button);