void PopulateXmlSchemaFileAssociationList()
 {
     foreach (string extension in xmlFileExtensions)
     {
         XmlSchemaFileAssociation         association = associations.GetSchemaFileAssociation(extension);
         XmlSchemaFileAssociationListItem item        = new XmlSchemaFileAssociationListItem(extension, association.NamespaceUri, association.NamespacePrefix);
         schemasPanel.AddXmlSchemaFileAssociationListItem(item);
     }
     schemasPanel.AddXmlSchemaFileAssociationListSortDescription("Extension", ListSortDirection.Ascending);
 }