valueCol.setEditor(new GridEditor(new TextField()));
valueCol.setFixed(false);
ColumnConfig[] columnConfigs = {keyCol, valueCol};
ColumnModel columnModel = new ColumnModel(columnConfigs);
columnModel.setDefaultSortable(true);
final EditorGridPanel grid = new EditorGridPanel();
Toolbar toolbar = new Toolbar();
ToolbarButton add = new ToolbarButton(constants.Add(), new ButtonListenerAdapter() {