add(editPeriodForm);
editPeriodForm.setOutputMarkupPlaceholderTag(true);
editPeriodForm.setVisible(false);
// New Period
addPeriodPanel = new AddPeriodPanel("addPeriodPanel");
add(addPeriodPanel);
addPeriodPanel.setOutputMarkupPlaceholderTag(true);
addPeriodPanel.setVisible(false);
AjaxFallbackLink<Object> addPeriodButton = new AjaxFallbackLink<Object>("addPeriodButton") {
private static final long serialVersionUID = 1L;