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This is Gavotte feature.
By the way, this is specified in the WSDL Editor Functional Spec as HL-UC-20. http://alaska.stc.com:10000/alaska/Wiki.jsp?page=WSDLEditorGavotteSpec
Implemented in release551 branch. wsdlui/src/org/netbeans/modules/xml/wsdl/ui/view/grapheditor/Bundle.properties; new revision: 1.1.2.3; previous revision: 1.1.2.2 wsdlui/src/org/netbeans/modules/xml/wsdl/ui/view/grapheditor/GraphView.java; new revision: 1.1.4.15; previous revision: 1.1.4.14
Verified on Windows XP with Gavotte build 070111_20 and JDK 1.5.0_10.