public function lstQuantity_Change($strFormId, $strControlId, $strParameter)
{
$lstQuantity = $this->GetControl($strControlId);
$objFormProduct = FormProduct::Load($strParameter);
$objSignupProduct = SignupProduct::LoadBySignupEntryIdFormProductId($this->objSignupEntry->Id, $objFormProduct->Id);
if (!$objSignupProduct) {
if ($lstQuantity->SelectedValue) {
$this->objSignupEntry->AddProduct($objFormProduct, $lstQuantity->SelectedValue);
}
} else {
if ($lstQuantity->SelectedValue) {
$objSignupProduct->Quantity = $lstQuantity->SelectedValue;
$objSignupProduct->Save();
} else {
$objSignupProduct->Delete();
}
$this->objSignupEntry->RefreshAmounts();
}
$this->RefreshForm();
}