* <code>Widget</code>.
*/
protected static void assertHasWidgetSimpleContainer(XmlObjectInfo container,
boolean forCanvas,
boolean expected) throws Exception {
SimpleContainerFactory factory = new SimpleContainerFactory(container, forCanvas);
List<SimpleContainer> simpleContainers = factory.get();
// check each factory
WidgetInfo button = createButton();
for (SimpleContainer simpleContainer : simpleContainers) {
boolean valid = simpleContainer.validateComponent(button);
assertThat(valid).isEqualTo(expected);