final ListMultipleChoice rolesChoiceField = new ListMultipleChoice("user.roles",
allRoles);
add(rolesChoiceField);
final TextField rolesSetNameField = new TextField("user.rolesSetName");
add(rolesSetNameField);
add(new AbstractFormValidator()
{
public FormComponent[] getDependentFormComponents()
{
// name and roles don't have anything to validate,
// so might as well just skip them here