onTileGroupEvent

Applies event to this tile's local state as part of a group-wide broadcast — invoked only on holders whose handlesGroupEvent returned true for the same event, via TileRenderingScope.dispatchGroupEvent. The default implementation does nothing; override it alongside handlesGroupEvent on a TileHolder that participates in a mutual-exclusion-style group (the way RadioButton clears every other radio button sharing its groupId).

Parameters