The connection nodes in the services windows are sorted case insensitive (ConnectionNodeProvider.ConnectionComparator), as is the connection list (DatabaseExplorerUIs.ConnectionComparator). In contrast to this the drop down list in the SQL editor toolbar is sorted case sensitive. This should be unified:

# This patch file was generated by NetBeans IDE
# It uses platform neutral UTF-8 encoding and \n newlines.
--- Base (BASE)
+++ Locally Modified (Based On LOCAL)
@@ -338,7 +338,7 @@
             Collections.sort(connectionList, new Comparator<DatabaseConnection>() {
                 @Override
                 public int compare(DatabaseConnection o1, DatabaseConnection o2) {
-                    return o1.getDisplayName().compareTo(o2.getDisplayName());
+                    return o1.getDisplayName().compareToIgnoreCase(o2.getDisplayName());
                 }
             });
         }