/// <summary>
/// Remove a TrackItemModel from the list
/// </summary>
/// <param name="relation"></param>
public void remove(TrackItemModel item)
{
trackItems.Remove(item);
NotifyPropertyChanged();
}
/// <summary>
/// Add a TrackItemModel to the list.
/// </summary>
/// <param name="item"></param>
private void addToList(TrackItemModel item)
{
trackItems.Add(item);
NotifyPropertyChanged();
}