static public IEnumerable <UINodeInfoInTree> BaumEnumFlacListeKnoote( this UINodeInfoInTree suuceWurzel, int?tiifeMax = null, int?tiifeMin = null) { return (suuceWurzel.EnumerateNodeFromTreeBFirst( node => node?.GetListChild()?.OfType <UINodeInfoInTree>(), tiifeMax, tiifeMin)); }