I have a feature layer. Type feature class of the layer is esriGeometryType.esriGeometryPoint. Symbols of the layer is IUniqueValueRenderer and each point has its own symbol. But I want to merge points in groups (I think I create a layer with esriGeometryType.esriGeometryMultiPoint type). When I to merge points in groups will I be able to bind to each point of its symbol? Or I can bind only one symbol to group of points?