diff --git a/kivyblocks/dg.py b/kivyblocks/dg.py
index 2eaf5d6..ec79b22 100644
--- a/kivyblocks/dg.py
+++ b/kivyblocks/dg.py
@@ -30,13 +30,14 @@ from .widget_css import WidgetCSS
 def field_widget(desc, rec):
 	viewer = desc.get('viewer')
 	if viewer:
-		if not isinstance(viewer,'str'):
+		if not isinstance(viewer,str):
 			viewer = json.dumps(viewer)
-		rendered = string_template_render(desc.get('viewer'), rec)
+		rendered = string_template_render(viewer, rec)
 		dic = json.loads(rendered)
 		if dic is None:
 			return None
-		return Factory.Blocks(dic)
+		blocks = Factory.Blocks()
+		return blocks.widgetBuild(dic)
 
 	uitype = desc.get('uitype', 'str')
 	if uitype is None:
@@ -91,17 +92,6 @@ class Cell(ButtonBehavior, WidgetCSS, BoxLayout):
 							height = self.row.part.datagrid.rowHeight(),
 							csscls=csscls
 		)
-		if not self.row.header and self.desc.get('viewer'):
-			viewer = self.desc.get('viewer')
-			blocks = Factory.Blocks()
-			if isinstance(viewer,str):
-				l = self.desc.copy()
-				l['row'] = self.row
-				viewer = blocks.eval(viewer,l)
-			if isinstance(viewer,dict):
-				w = blocks.widgetBuild(viewer)
-				self.add_widget(w)
-				return
 		if desc['header']:
 			bl = Text(i18n=True, text=str(desc['value']),
 				font_size=CSize(1),wrap=True,
diff --git a/kivyblocks/pagepanel.py b/kivyblocks/pagepanel.py
index 1122a91..220eb7a 100644
--- a/kivyblocks/pagepanel.py
+++ b/kivyblocks/pagepanel.py
@@ -131,12 +131,17 @@ sub-widget's description file format
 ## 
 
 	"""
-	def __init__(self, bar_size=2, bar_css='default',csscls='default',
-					bar_at='top', enable_on_close=False, 
+	def __init__(self, bar_size=2, 
+					bar_css='default',
+					csscls='default',
+					singlepage=False,
+					bar_at='top', 
+					enable_on_close=False, 
 					left_menu=None, **kw):
 		print('PagePanel().__init__():', bar_size, bar_at, left_menu)
 		self.bar_size = bar_size
 		self.bar_at = bar_at
+		self.singlepage = singlepage
 		self.swipe_buffer = []
 		self.swipe_right = False
 		
@@ -276,6 +281,8 @@ sub-widget's description file format
 		self.clear_widgets()
 		if len(self.sub_widgets) > 0:
 			pass
+		if self.singlepage:
+			self.sub_widgets = []
 		self.sub_widgets.append(w)
 		self.show_currentpage()
 
diff --git a/kivyblocks/tree.py b/kivyblocks/tree.py
index 6ab875b..60e2a13 100644
--- a/kivyblocks/tree.py
+++ b/kivyblocks/tree.py
@@ -8,12 +8,14 @@ from kivy.logger import Logger
 from kivy.graphics import Color, Rectangle, Triangle
 from kivy.uix.boxlayout import BoxLayout
 from kivy.uix.label import Label
+from kivy.uix.image import AsyncImage
 from kivy.uix.widget import Widget
 from kivy.uix.button import ButtonBehavior
 from kivyblocks.widgetExt import ScrollWidget
 from kivyblocks.utils import CSize
 from appPublic.dictObject import DictObject
 from appPublic.jsonConfig import getConfig
+from appPublic.registerfunction import getRegisterFunctionByName
 from .baseWidget import PressableLabel, Text, HBox, VBox
 from .color_definitions import getColors
 from .widget_css import WidgetCSS