diff --git a/src/zmapWindow/zmapWindowItemFeatureSet.c b/src/zmapWindow/zmapWindowItemFeatureSet.c
new file mode 100755
index 0000000000000000000000000000000000000000..1385b43c4e142326f3ea034cea1d0f1c724affd1
--- /dev/null
+++ b/src/zmapWindow/zmapWindowItemFeatureSet.c
@@ -0,0 +1,95 @@
+/*  File: zmapWindowItemFeatureSet.c
+ *  Author: Roy Storey (rds@sanger.ac.uk)
+ *  Copyright (c) 2007: Genome Research Ltd.
+ *-------------------------------------------------------------------
+ * ZMap is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ * or see the on-line version at http://www.gnu.org/copyleft/gpl.txt
+ *-------------------------------------------------------------------
+ * This file is part of the ZMap genome database package
+ * originally written by:
+ *
+ * 	Ed Griffiths (Sanger Institute, UK) edgrif@sanger.ac.uk,
+ *      Roy Storey (Sanger Institute, UK) rds@sanger.ac.uk
+ *
+ * Description: 
+ *
+ * Exported functions: See XXXXXXXXXXXXX.h
+ * HISTORY:
+ * Last edited: Jul 30 16:50 2007 (rds)
+ * Created: Mon Jul 30 13:09:33 2007 (rds)
+ * CVS info:   $Id: zmapWindowItemFeatureSet.c,v 1.1 2007-07-31 16:21:15 rds Exp $
+ *-------------------------------------------------------------------
+ */
+
+#include <zmapWindow_P.h>
+
+static void removeList(gpointer data, gpointer user_data_unused) ;
+
+
+ZMapWindowItemFeatureSetData zmapWindowItemFeatureSetCreate(ZMapWindow window,
+                                                            ZMapFeatureTypeStyle style,
+                                                            ZMapStrand strand,
+                                                            ZMapFrame frame)
+{
+  ZMapWindowItemFeatureSetData item_feature_set = NULL;
+
+  if((item_feature_set = g_new0(ZMapWindowItemFeatureSetDataStruct, 1)))
+    {
+      item_feature_set->strand      = strand;
+      item_feature_set->frame       = frame;
+      item_feature_set->style       = zMapFeatureStyleCopy(style) ;
+      item_feature_set->style_table = zmapWindowStyleTableCreate() ;
+      item_feature_set->window      = window;
+      item_feature_set->user_hidden_stack = g_queue_new();
+    }
+
+  return item_feature_set;
+}
+
+void zmapWindowItemFeatureSetDestroy(ZMapWindowItemFeatureSetData item_feature_set)
+{
+  item_feature_set->window = NULL; /* not ours ... */
+
+  if(item_feature_set->style)
+    zMapFeatureTypeDestroy(item_feature_set->style);
+
+  if(item_feature_set->style_table)
+    zmapWindowStyleTableDestroy(item_feature_set->style_table);
+
+  /* Get rid of stack or user hidden items. */
+  if(!g_queue_is_empty(item_feature_set->user_hidden_stack))
+    g_queue_foreach(item_feature_set->user_hidden_stack, removeList, NULL) ;
+
+  if(item_feature_set->user_hidden_stack)
+    g_queue_free(item_feature_set->user_hidden_stack);
+
+  g_free(item_feature_set);
+
+  return ;
+}
+
+
+/* INTERNAL */
+
+static void removeList(gpointer data, gpointer user_data_unused)
+{
+  GList *user_hidden_items = (GList *)data ;
+
+  g_list_free(user_hidden_items) ;
+
+  return ;
+}
+
+