rowDataLayer = new SpanningDataLayer(getRowDataProvider()); // getRowDataProvider() returns ISpanningDataProvider

//create a new ConfigRegistry which will be needed for GlazedLists handling
ConfigRegistry configRegistry = new ConfigRegistry();
   		
CompositeMatcherEditor<String> autoFilterMatcherEditor = new CompositeMatcherEditor<String>();
  
DefaultGlazedListsStaticFilterStrategy<String> filterStrategy = new DefaultGlazedListsStaticFilterStrategy<String>(autoFilterMatcherEditor, null, configRegistry);
filterStrategy.addStaticFilter(new Matcher<String>() {

	@Override
	public boolean matches(String item) {
		return true; // for testing - match everything for now
	}
});
   		
rowDataLayer = new FilterRowDataLayer<String>(filterStrategy, rowDataLayer, getRowDataProvider(), configRegistry);