--- a/src/browser/sat_browser/base_widget.py	Tue Sep 23 11:48:57 2014 +0200
+++ b/src/browser/sat_browser/base_widget.py	Tue Sep 23 13:57:36 2014 +0200
@@ -229,11 +229,11 @@
 class LiberviaWidget(DropCell, VerticalPanel, ClickHandler):
     """Libervia's widget which can replace itself with a dropped widget on DnD"""
 
-    def __init__(self, host, title='', info='', selectable=False):
+    def __init__(self, host, title='', info=None, selectable=False):
         """Init the widget
         @param host (SatWebFrontend): SatWebFrontend instance
         @param title (str): title shown in the header of the widget
-        @param info (str): info shown in the header of the widget
+        @param info (str, callable): info shown in the header of the widget
         @param selectable (bool): True is widget can be selected by user"""
         VerticalPanel.__init__(self)
         DropCell.__init__(self, host)
@@ -244,8 +244,13 @@
         self.__close_button_id = HTMLPanel.createUniqueId()
         self.__title = Label(title)
         self.__title.setStyleName('widgetHeader_title')
-        if info:
-            self.__info = HTML(info)
+        if info is not None:
+            if isinstance(info, str):
+                self.__info = HTML(info)
+            else:  # the info will be set by a callback
+                assert(callable(info))
+                self.__info = HTML()
+                info(self.__info.setHTML)
             self.__info.setStyleName('widgetHeader_info')
         else:
             self.__info = None
@@ -394,7 +399,7 @@
         @param text: text of the new title"""
         try:
             self.__info.setHTML(text)
-        except AttributeError:
+        except TypeError:
             log.error("LiberviaWidget.setInfo: info widget has not been initialized!")
 
     def isSelectable(self):