toolbar.addFixed( progressBar );
ButtonBarBuilder builder = new ButtonBarBuilder();
builder.addFixed( new JLabel( "Threads:" ) );
builder.addRelatedGap();
threadsSpinner = new JSpinner( new SpinnerNumberModel( getModelItem().getThreadCount(), 1, 9999, 1 ) );
threadsSpinner.setToolTipText( "Sets the number of threads (\"Virtual Users\") to run this TestCase" );
UISupport.setPreferredHeight( threadsSpinner, 18 );
threadsSpinner.getModel().addChangeListener( new ChangeListener()