. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 295 25.9. Validators must not change any data or models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 295 have the following set of panels: • HeaderPanel 21 • FooterPanel • MenuPanel Content area will change from page to page, so we don’t need a reusable panel for it. 5.3.2. Template page Now we can build recommended not to directly override these method, but rather to use onConfigure to change component states. On the contrary method onBeforeRender (see the next paragraph)

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 282 25.9. Validators must not change any data or models. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . will have the following set of panels: • HeaderPanel • FooterPanel • MenuPanel Content area will change from page to page, so we don’t need a reusable panel for it. 5.3.2. Template page Now we can build it’s highly recommended not to directly override these method, but rather to use onConfigure() to change component states. On the contrary method onBeforeRender (see the next paragraph) is not indicated

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 281 25.9. Validators must not change any data or models. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . will have the following set of panels: • HeaderPanel • FooterPanel • MenuPanel Content area will change from page to page, so we don’t need a reusable panel for it. 5.3.2. Template page Now we can build it’s highly recommended not to directly override these method, but rather to use onConfigure() to change component states. On the contrary method onBeforeRender (see the next paragraph) is not indicated

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 294 25.9. Validators must not change any data or models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 294 will have the following set of panels: • HeaderPanel • FooterPanel • MenuPanel Content area will change from page to page, so we don’t need a reusable panel for it. 5.3.2. Template page Now we can build it’s highly recommended not to directly override these method, but rather to use onConfigure() to change component states. On the contrary method onBeforeRender (see the next paragraph) is not indicated

Code AjaxFormComponentUpdatingBehavior ajaxBehavior = new AjaxFormComponentUpdatingBehavior("change"){ @Override protected void onUpdate(AjaxRequestTarget target) { //... }