public BarRendererBase GetRendererForBar(string key, Bar bar)
{
var barRendererId = GetBarRendererId(bar.Staff.Track.Index, bar.Index);
if (_barRendererLookup.ContainsKey(key) && _barRendererLookup[key].ContainsKey(barRendererId))
{
return _barRendererLookup[key][barRendererId];
}
return null;
}