public void Add(KeyFrame kf)
{
KeyFrameTray f = new KeyFrameTray(kf, s);
frames.AddLast(f);
addToGrid(frames.Count - 1, f);
}
private void addToGrid(int i, KeyFrameTray f)
{
var d = new RowDefinition();
d.Height = new GridLength(f.Height);
grid.RowDefinitions.Add(d);
grid.Children.Add(f);
Grid.SetRow(f, i);
}