gistfile1.java

@EntryPoint
@Templated
public class HelloWorldForm extends Composite {
  @Inject @Admin @DataField Button deleteButton;
  @Inject SessionManager sessionManager;
 
 
  @EventHandler("deleteButton")
  private void handleSendClick(ClickEvent event) {
    // do some deleting!
  }
 
  @Admin
  private void applyAdminStyling(Style style) {
    if (!sessionManager.isAdmin()) {
      style.setVisibility(Style.Visibility.HIDDEN);
    }
  }
}