toolbar.addUnrelatedGap();
operationCombo = new JComboBox( new ExtendedComboBoxModel() );
operationCombo.setPreferredSize( new Dimension( 150, 20 ) );
operationCombo.addItemListener( new OperationComboListener() );
toolbar.addLabeledFixed( "Operation", operationCombo );
WsdlOperation operation = getModelItem().getOperation();
interfaceCombo.setSelectedItem( operation == null ? null : operation.getInterface().getName() );
operationCombo.setSelectedItem( operation == null ? null : operation.getName() );