<?php 
 public function onDetailAdd( $param )
    {
        try
        {
            $this->form->validate();
            $data = $this->form->getData();
            
            /** validation sample
            if (empty($data->fieldX))
            {
                throw new Exception('The field fieldX is required');
            }
            **/
            
             
            
            $obs = implode(",", $data->detail_obs);
            
            
            $uniqid = !empty($data->detail_uniqid) ? $data->detail_uniqid : uniqid();
            
            
            $grid_data = [];
            $grid_data['uniqid'] = $uniqid;
            $grid_data['id'] = $data->detail_id;
            $grid_data['jaimprimiu'] = 'N';
            $grid_data['obs'] = $obs;
            $grid_data['produto_id'] = $data->detail_produto_id;
            $grid_data['quantidade'] = $data->detail_quantidade;
            $grid_data['preco'] = $data->detail_preco;
            $grid_data['garcon_id'] = $data->detail_garcon_id;
          
            
          
            
            // insert row dynamically
            $row = $this->detail_list->addItem( (object) $grid_data );
            $row->id = $uniqid;
            
            TDataGrid::replaceRowById('VendasItens_list', $uniqid, $row);
            
           
            
            // clear detail form fields
            $data->detail_uniqid = '';
            $data->detail_id = '';
            $data->detail_produto_id = '';
            $data->detail_quantidade = '';
            $data->detail_preco = '';
            
            
            $data->detail_obs = '';     AQUI MAS NÃO LIMPA
            
            
            
            //$multi->setValue(array('aaa','bbb'));
            
         // $data->detail_garcon_id = '';
            
            // send data, do not fire change/exit events
            TForm::sendData( 'form_Vendas', $data, false, false );
        }
        catch (Exception $e)
        {
            $this->form->setData( $this->form->getData());
            new TMessage('error', $e->getMessage());
        }
    }
?>