kartik\builder\TabularForm::init PHP Method

    public function init()
    {
        parent::init();
        $dp = static::slash(BaseDataProvider::className());
        if (empty($this->dataProvider) || !$this->dataProvider instanceof BaseDataProvider) {
            throw new InvalidConfigException("The 'dataProvider' property must be set and must be an instance of '{$dp}'.");
        }
        $kvGrid = static::slash(GridView::classname());
        if (empty($this->gridClass)) {
            $this->gridClass = $kvGrid;
        } elseif ($this->gridClass !== $kvGrid && !is_subclass_of($this->gridClass, $kvGrid)) {
            throw new InvalidConfigException("The 'gridClass' must be a class which extends from '{$kvGrid}'.");
        }
        $this->initOptions();
        $this->registerAssets();
    }