}
protected FileParamPanel buildFileParamPanel(final IModel paramsModel) {
FileParamPanel file = new FileParamPanel("url", new MapModel(paramsModel, URLP.key),
new ParamResourceModel("shapefile", this), true);
file.setFileFilter(new Model(new ExtensionFileFilter(".shp")));
file.getFormComponent().add(new FileExistsValidator());
return file;
}