public void AddPlayList()
{
if (SelectedModels.Count != 0)
{
PlayList list = new PlayList(ID, Name);
foreach (Composition comp in SelectedModels)
{
list.AddComposition(comp);
}
PlayListViewModel playlist = new PlayListViewModel(list, Name);
viewModels.Add(playlist);
NotifyPropertyChanged(String.Empty);
}
}