public function setSubFormDataHandler($tag, $paramName)
    {
        $this->formDataEvent($tag, function (Params $params) use ($paramName) {return Params::create($params->get($paramName));});

        return $this;
    }
public function setSubFormDataHandler($tag, $paramName)
    {
        $this->formDataEvent($tag, function (Params $params) use ($paramName) {return Params::create($params->get($paramName));});

        return $this;
    }
public function setSubFormDataHandler ( $ tag , $ paramName ) { $ this -> formDataEvent ( $ tag , function ( Params $ params ) use ( $ paramName ) { return Params :: create ( $ params -> get ( $ paramName ) ) ; } ) ; return $ this ; }
Handler for subform data
@param $tag
@param $paramName
@return $this
Handler for subform data