diff --git a/seminar/views/views_all.py b/seminar/views/views_all.py
index 9bb5276e..2e9bd864 100644
--- a/seminar/views/views_all.py
+++ b/seminar/views/views_all.py
@@ -106,16 +106,20 @@ class TNLData(object):
 		return out
 	
 	@classmethod
-	def filter_treenode(cls, treenode, predicate):
-		tnll = cls._filter_treenode_recursive(treenode, predicate) # TreeNodeList List :-)
-		# Teď vyrobíme virtuální TNL, který nemá obsah, ale má za potomky všecny nalezené TNLData
+	def from_tnldata_list(cls, tnllist):
+		"""Vyrobíme virtuální TNL, který nemá obsah, ale má za potomky všechna zadaná TNLData"""
 		result = cls(None)
-		for idx, tnl in enumerate(tnll):
+		for idx, tnl in enumerate(tnllist):
 			result.children.append(tnl)
 			tnl.parent = result
 			tnl.index = idx
 		return result
 
+	@classmethod
+	def filter_treenode(cls, treenode, predicate):
+		tnll = cls._filter_treenode_recursive(treenode, predicate) # TreeNodeList List :-)
+		return TNLData.from_tnldata_list(tnll)
+
 	@classmethod
 	def _filter_treenode_recursive(cls, treenode, predicate):
 		if predicate(treenode):