code: protected void loadData() {
  
          try {
              List<CmsProperty> propList = m_context.getCms().readPropertyObjects(m_resource, false);
              List<CmsProperty> inheritedPropList = m_context.getCms().readPropertyObjects(m_resource, true);
              Map<String, CmsProperty> propMap = CmsProperty.toObjectMap(propList);
              Map<String, CmsProperty> inheritedPropMap = CmsProperty.toObjectMap(inheritedPropList);
              String secureValue = convertPropertyToFieldValue(propMap.get(CmsPropertyDefinition.PROPERTY_SECURE));
              String inheritedSecureValue = convertPropertyToFieldValue(
                  inheritedPropMap.get(CmsPropertyDefinition.PROPERTY_SECURE));
  
              String exportValue = convertPropertyToFieldValue(propMap.get(CmsPropertyDefinition.PROPERTY_EXPORT));
  
              CmsProperty exportnameProp = propMap.get(CmsPropertyDefinition.PROPERTY_EXPORTNAME);
              String exportnameValue = "";
              if (exportnameProp != null) {
                  exportnameValue = exportnameProp.getValue();
              }
              m_exportField.setValue(exportValue);
              m_secureField.setValue(secureValue);
              if ("".equals(secureValue) && !"".equals(inheritedSecureValue)) {
                  String origin = m_context.getCms().getRequestContext().removeSiteRoot(
                      inheritedPropMap.get(CmsPropertyDefinition.PROPERTY_SECURE).getOrigin());
                  String inheritedValueCaption = CmsVaadinUtils.getMessageText(
                      org.opencms.workplace.commons.Messages.GUI_SECURE_INHERIT_FROM_2,
                      inheritedSecureValue,
                      origin);
                  m_secureField.setItemCaption("", inheritedValueCaption);
              }
  
              m_exportNameField.setValue(exportnameValue);
              m_internalField.setValue(Boolean.valueOf(m_resource.isInternal()));
          } catch (CmsException e) {
              m_context.error(e);
  
          }
      }
docs: Loads the dialog data.<p>