public void RevertLastBar()
{
if (MasterBars.Count > 1)
{
MasterBars.RemoveAt(MasterBars.Count - 1);
var w = 0f;
for (int i = 0, j = _allStaves.Count; i < j; i++)
{
var s = _allStaves[i];
w = Math.Max(w, s.BarRenderers[s.BarRenderers.Count - 1].Width);
s.RevertLastBar();
}
Width -= w;
}
}