onValidate callback in Forms\Container not called when submitting Form

[janedbal]

Really confusing about creating form containers is that you cannot use onValidate property for adding validation callbacks. It is never used. See following example.

class HomepagePresenter extends BasePresenter {

  protected function createComponentTestForm(){
    $form = new \Nette\Application\UI\Form;
    $form->addContainer("container"); // just exmaple, could be separate class
    $form["container"]->addText("foo", "Bar");
    $form["container"]->onValidate[] = array($this, "containerValidation");
    $form->addSubmit("send");
    $form->onValidate[] = array($this, "formValidation");
    return $form;
  }

  public function formValidation(){
        echo "validation from form ok"; // works
  }

   public function containerValidation(){
        echo "validation from container ok"; // doesn't work
   }
}

I understand that this callback is used by Form which extends Forms\Container, but if it cannot be used in "standalone" form container, shouldn't this property be in Form? Also the phpdoc makes the confusion even bigger. It says: "Occurs when the form is validated".

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EDIT: removed workaround