protected override void SetupCells()
{
base.SetupCells();
CELL_hasBranch = EnsureCell("hasBranch", false);
CELL_branchNode = EnsureCell("branchNode", "undefined");
CELL_handle = EnsureCell("handle", "");
CELL_isListening = EnsureCell("isListening", false);
CELL_expressions = EnsureCell("expressions", new string[] {});
CELL_eventName = EnsureCell("eventName", "");
}