Nette\Forms\Controls\BaseControl::setDefaultValue PHP Method

    public function setDefaultValue($value)
    {
        $form = $this->getForm(FALSE);
        if ($this->isDisabled() || !$form || !$form->isAnchored() || !$form->isSubmitted()) {
            $this->setValue($value);
        }
        return $this;
    }

 public function setDefaultValue($value)
 {
     parent::setDefaultValue($value);
     if (is_array($this->disabled) && !is_array($value)) {
         $key = key(array($value => NULL));
         if (isset($this->disabled[$key]) && $this->value === NULL) {
             $this->value = $key;
         }
     }
     return $this;
 }