diff --git a/xs/xsp/GUI_3DScene.xsp b/xs/xsp/GUI_3DScene.xsp
index 2a963b16a..13f0d42f2 100644
--- a/xs/xsp/GUI_3DScene.xsp
+++ b/xs/xsp/GUI_3DScene.xsp
@@ -95,6 +95,9 @@
         %code%{ 
             if (idx > 0 && idx < int(THIS->volumes.size())) {
                 std::swap(THIS->volumes[idx-1], THIS->volumes[idx]);
+                std::swap(THIS->volumes[idx-1]->composite_id,    THIS->volumes[idx]->composite_id);
+                std::swap(THIS->volumes[idx-1]->select_group_id, THIS->volumes[idx]->select_group_id);
+                std::swap(THIS->volumes[idx-1]->drag_group_id,   THIS->volumes[idx]->drag_group_id);
                 RETVAL = true;
             } else
                 RETVAL = false;
@@ -103,6 +106,9 @@
         %code%{ 
             if (idx >= 0 && idx + 1 < int(THIS->volumes.size())) {
                 std::swap(THIS->volumes[idx+1], THIS->volumes[idx]);
+                std::swap(THIS->volumes[idx+1]->composite_id,    THIS->volumes[idx]->composite_id);
+                std::swap(THIS->volumes[idx+1]->select_group_id, THIS->volumes[idx]->select_group_id);
+                std::swap(THIS->volumes[idx+1]->drag_group_id,   THIS->volumes[idx]->drag_group_id);
                 RETVAL = true;
             } else
                 RETVAL = false;