* set refreshing period on source. WARNING WORKS ONLY FOR KEY FIELD
*/
protected void applyRefreshingPeriod() {
if (mybox.isTargetConnected(widget, key)) {
final TangoDataSourceFactory factory = (TangoDataSourceFactory) DataSourceProducerProvider
.getProducer(TangoDataSourceFactory.SOURCE_PRODUCER_ID);
// factory.setRefreshingStrategy(factory.createDataSource(key),
// RefreshingStrategy.GROUPED_BY_REFRESHING_PERIOD,
// this.refreshingPeriod);
factory.setRefreshingStrategy(key, new PolledRefreshingStrategy(refreshingPeriod));
// p�riode par d�faut
// TangoDataSourceFactory.DEFAULT_SLEEPING_PERIOD
}
}