sourceStepCombo = form.appendComboBox( "Interfaces", sourceStepComboModel, "Target Interface" );
sourceStepCombo.setRenderer( new ModelItemListCellRenderer() );
for( Interface element : ifaces )
sourceStepComboModel.addElement( element );
propertiesCombo = form.appendComboBox( operationType, ( ( Interface )sourceStepCombo.getSelectedItem() )
.getOperationList().toArray(), "Target " + operationType );
propertiesCombo.setRenderer( new ModelItemListCellRenderer() );
sourceStepCombo.addActionListener( new ActionListener()
{