void UpdateXmlSchemaFileAssociations()
 {
     for (int i = 0; i < schemasPanel.XmlSchemaFileAssociationListItemCount; ++i)
     {
         XmlSchemaFileAssociationListItem item = schemasPanel.GetXmlSchemaFileAssociationListItem(i);
         if (item.IsDirty)
         {
             XmlSchemaFileAssociation association = new XmlSchemaFileAssociation(item.Extension, item.NamespaceUri, item.NamespacePrefix);
             associations.SetSchemaFileAssociation(association);
         }
     }
 }