diff --git a/browser/configure.zcml b/browser/configure.zcml
index 07d4d9b..811184f 100644
--- a/browser/configure.zcml
+++ b/browser/configure.zcml
@@ -155,14 +155,23 @@
 
   <!-- document -->
 
+  <!--<zope:view
+      type="zope.publisher.interfaces.browser.IBrowserRequest"
+      for="zope.schema.interfaces.IBytes"
+      provides="zope.app.form.interfaces.IInputWidget"
+      factory=".resource.DataWidget"
+      permission="zope.Public"
+      name="loops.resource.DataWidget"
+      />-->
+
   <addform
       label="Add Document"
       name="AddLoopsDocument.html"
       schema="loops.interfaces.IDocument"
       fields="title data contentType"
       content_factory="loops.resource.Document"
-      permission="zope.ManageContent"
-      />
+      permission="zope.ManageContent" />
+  
 
   <addMenuItem
       class="loops.resource.Document"
@@ -179,8 +188,7 @@
       fields="title data contentType"
       for="loops.interfaces.IDocument"
       permission="zope.ManageContent"
-      menu="zmi_views" title="Edit"
-      />
+      menu="zmi_views" title="Edit" />      
 
   <!-- media asset -->
 
@@ -192,7 +200,7 @@
       content_factory="loops.resource.MediaAsset"
       permission="zope.ManageContent"
       />
-
+    
   <addMenuItem
       class="loops.resource.MediaAsset"
       title="Media Asset"
@@ -210,7 +218,7 @@
       permission="zope.ManageContent"
       menu="zmi_views" title="Edit"
       />
-
+    
   <!-- view manager -->
 
   <addform
diff --git a/resource.py b/resource.py
index 8e5afaa..e84505c 100644
--- a/resource.py
+++ b/resource.py
@@ -28,6 +28,7 @@ from zope.app.container.contained import Contained
 from zope.app.file.image import Image as BaseMediaAsset
 from zope.interface import implements
 from persistent import Persistent
+from cStringIO import StringIO
 from cybertools.relation.registry import getRelations
 
 from interfaces import IResource, IDocument, IMediaAsset
@@ -45,7 +46,9 @@ class Resource(Contained, Persistent):
     title = property(getTitle, setTitle)
 
     _contentType = ''
-    def setContentType(self, contentType): self._contentType = contentType
+    def setContentType(self, contentType):
+        if contentType:
+            self._contentType = contentType
     def getContentType(self): return self._contentType
     contentType = property(getContentType, setContentType)
 
@@ -56,7 +59,7 @@ class Resource(Contained, Persistent):
     def __init__(self, title=u''):
         self.title = title
 
-    _size = 0
+    _size = _width = _height = 0
 
 
 class Document(Resource):
@@ -78,13 +81,16 @@ class MediaAsset(Resource, BaseMediaAsset):
         self.title = title
 
     def _setData(self, data):
-        super(MediaAsset, self)._setData(data)
+        dataFile = StringIO(data)  # let File tear it into pieces
+        super(MediaAsset, self)._setData(dataFile)
         if not self.contentType:
             self.guessContentType(data)
 
     data = property(BaseMediaAsset._getData, _setData)
 
     def guessContentType(self, data):
+        if not isinstance(data, str): # seems to be a file object
+            data = data.read(20)
         if data.startswith('%PDF'):
             self.contentType = 'application/pdf'