CellBrowser with CustomTreeViewModel not redraw or repaint with CustomListDataProvider

Hi,I wanted to to tell you that I am not able to re paint the
CellBrowser by ListDataProvider . My code is:

public class CustomTreeModel implements TreeViewModel {

private ArticuloFormularioSeleccionCategoriaUIHandlers iuHandler;

private final SingleSelectionModel<String> selectionModel = new
SingleSelectionModel<String>();

// Mapa de prueba q simula el servicio del server de consulta de
categoria relacionada
public static HashMap<String, ArrayList<String>> categorias = new
HashMap<String, ArrayList<String>>();

/**
* Get the {@link NodeInfo} that provides the children of the
specified value.
*/
@Override
public <T> NodeInfo<?> getNodeInfo(T value) {

String categoriaSelected = value == null ? null : (String) value;

CategoriaProvider dataProvider = new CategoriaProvider(iuHandler,
categoriaSelected);

// Return a node info that pairs the data with a cell.
return new DefaultNodeInfo<String>(dataProvider, new TextCell(),
selectionModel, null);
}

public void cargarDatos() {

}

/**
* Check if the specified value represents a leaf node. Leaf nodes
cannot be opened.
*/
public boolean isLeaf(Object value) {
ArrayList<String> subCategorias = categorias.get(value.toString());
return (subCategorias == null) ? true : false;
}

public String getCategoriaSeleccionada() {
return selectionModel.getSelectedObject();
}

public SingleSelectionModel getSelecctionHandler() {
return this.selectionModel;
}

public ArticuloFormularioSeleccionCategoriaUIHandlers getIuHandler()
{
return iuHandler;
}

public void
setIuHandler(ArticuloFormularioSeleccionCategoriaUIHandlers iuHandler)
{
this.iuHandler = iuHandler;
}

public class CategoriaProvider extends ListDataProvider<String> {

private ArticuloFormularioSeleccionCategoriaUIHandlers uiHandler;
private String categoriaSeleccionada;

public
CategoriaProvider(ArticuloFormularioSeleccionCategoriaUIHandlers
uiHandler, String categoria) {
super();
this.categoriaSeleccionada = categoria;
this.uiHandler = uiHandler;
}

@Override
protected void onRangeChanged(final HasData<String> display) {
super.onRangeChanged(display);

if (uiHandler == null)
return;

if (categoriaSeleccionada == null) {

uiHandler.getCategoriaDeArticuloClientService().obtenerCategoriasDeArticulos(new
AsyncCallback<ArrayList<CategoriaDeArticuloDto>>() {

@Override
public void onSuccess(ArrayList<CategoriaDeArticuloDto> result) {

ArrayList<String> categorias =
convertCategoriaDeArticuloDto(result);

List list = getList();

list.addAll(categorias);

updateRowCount(categorias.size(), true);
updateRowData(0, categorias);
refresh();

}

@Override
public void onFailure(Throwable caught) {
caught.printStackTrace();
// TODO falta log de error

}
});

}

}

}

public ArrayList<String>
convertCategoriaDeArticuloDto(ArrayList<CategoriaDeArticuloDto>
result) {

ArrayList<String> categoriasString = new ArrayList<String>();

if (result == null)
return categoriasString;

for (CategoriaDeArticuloDto dto : result) {
categoriasString.add(dto.nombre);
}

return categoriasString;

}

}

Anyone know why this happens?

Thank you very much!
Jero.

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