private void enableAddButton(ViewDefinitionState view) {
FormComponent form = (FormComponent) view.getComponentByReference(L_FORM);
Entity multiAssignment = form.getPersistedEntityWithIncludedFormValues();
GridComponent workersComponent = (GridComponent) view.getComponentByReference("workers");
WindowComponent window = (WindowComponent) view.getComponentByReference("window");
RibbonGroup add = (RibbonGroup) window.getRibbon().getGroupByName("add");
RibbonActionItem addMany = (RibbonActionItem) add.getItemByName("addManyWorkers");
if (workersComponent.getEntities().isEmpty() || !multiAssignment.isValid()) {
addMany.setEnabled(false);
addMany.requestUpdate(true);
} else {
addMany.setEnabled(true);
addMany.requestUpdate(true);
}
}
