/**
  * add the properties of a question part to the form
  *
  * @param object    form object to extend
  * @param object    question part object
  * @param integer    counter of the question part
  */
 private function initPartProperties($form, $part_obj = null, $counter = "1")
 {
     // Use a dummy part object for a new booking definition
     if (!isset($part_obj)) {
         $part_obj = new assAccountingQuestionPart($this->object);
     }
     // Part identifier (is 0 for a new part)
     $item = new ilHiddenInputGUI("parts[]");
     $item->setValue($part_obj->getPartId());
     $form->addItem($item);
     // Title
     $item = new ilFormSectionHeaderGUI();
     $item->setTitle($this->plugin->txt('accounting_table') . ' ' . $counter);
     $form->addItem($item);
     // Position
     $item = new ilNumberInputGUI($this->plugin->txt('position'), 'position_' . $part_obj->getPartId());
     $item->setSize(2);
     $item->setDecimals(1);
     $item->SetInfo($this->plugin->txt('position_info'));
     if ($part_obj->getPartId()) {
         $item->setValue(sprintf("%01.1f", $part_obj->getPosition()));
     }
     $form->addItem($item);
     // Text
     $item = new ilTextAreaInputGUI($this->plugin->txt("question_part"), 'text_' . $part_obj->getPartId());
     $item->setValue($this->object->prepareTextareaOutput($part_obj->getText()));
     $item->setRows(10);
     $item->setCols(80);
     if (!$this->object->getSelfAssessmentEditingMode()) {
         $item->setUseRte(TRUE);
         include_once "./Services/AdvancedEditing/classes/class.ilObjAdvancedEditing.php";
         $item->setRteTags(ilObjAdvancedEditing::_getUsedHTMLTags("assessment"));
         $item->addPlugin("latex");
         $item->addButton("latex");
         $item->addButton("pastelatex");
         $item->setRTESupport($this->object->getId(), "qpl", "assessment");
     } else {
         $item->setRteTags(self::getSelfAssessmentTags());
         $item->setUseTagsForRteOnly(false);
     }
     $form->addItem($item);
     // Booking XML definition
     $item = new ilCustomInputGUI($this->plugin->txt('booking_xml'));
     $item->setInfo($this->plugin->txt('booking_xml_info'));
     $tpl = $this->plugin->getTemplate('tpl.il_as_qpl_accqst_edit_xml.html');
     $tpl->setVariable("CONTENT", ilUtil::prepareFormOutput($part_obj->getBookingXML()));
     $tpl->setVariable("NAME", 'booking_xml_' . $part_obj->getPartId());
     $item->setHTML($tpl->get());
     // Booking file
     $subitem = new ilFileInputGUI($this->plugin->txt('booking_file'), "booking_file_" . $part_obj->getPartId());
     $subitem->setSuffixes(array('xml'));
     $item->addSubItem($subitem);
     // Download button
     if (strlen($part_obj->getBookingXML())) {
         $tpl = $this->plugin->getTemplate('tpl.il_as_qpl_accqst_form_custom.html');
         $this->ctrl->setParameter($this, 'xmltype', 'booking');
         $this->ctrl->setParameter($this, 'part_id', $part_obj->getPartId());
         $tpl->setCurrentBlock('button');
         $tpl->setVariable('BUTTON_HREF', $this->ctrl->getLinkTarget($this, 'downloadXml'));
         $tpl->setVariable('BUTTON_TEXT', $this->plugin->txt('download_booking_xml'));
         $tpl->ParseCurrentBlock();
         $subitem = new ilcustomInputGUI('');
         $subitem->setHTML($tpl->get());
         $item->addSubItem($subitem);
     }
     $form->addItem($item);
     // Delete Button
     if ($part_obj->getPartId()) {
         $tpl = $this->plugin->getTemplate('tpl.il_as_qpl_accqst_form_custom.html');
         $tpl->setCurrentBlock('button');
         $this->ctrl->setParameter($this, 'part_id', $part_obj->getPartId());
         $tpl->setVariable('BUTTON_HREF', $this->ctrl->getLinkTarget($this, 'deletePart'));
         $tpl->setVariable('BUTTON_TEXT', $this->plugin->txt('delete_accounting_table'));
         $tpl->ParseCurrentBlock();
         $item = new ilcustomInputGUI();
         $item->setHTML($tpl->get());
         $form->addItem($item);
     }
 }