}
private void buildUI() {
FlowPanel topPanel = new FlowPanel();
SimplePanel toolbarWrapper = new SimplePanel();
toolbarWrapper.setWidget( new BrowserToolbar() );
toolbarWrapper.setStyleName( "files-toolbar" ); //$NON-NLS-1$
topPanel.add( toolbarWrapper );
topPanel.add( new SolutionTreeWrapper( solutionTree ) );
solutionNavigatorPanel.setStyleName( "puc-vertical-split-panel" );