Suppress sub-palettes in radiopalette

src/sugar/activity/activity.py

@@ -1061,16 +1061,14 @@ def share_button(activity, **kwargs):
     palette = RadioPalette()
 
     private = RadioToolButton(
-            icon_name='zoom-home',
-            tooltip=_('Private'))
-    palette.append(private)
+            icon_name='zoom-home')
+    palette.append(private, _('Private'))
 
     neighborhood = RadioToolButton(
             icon_name='zoom-neighborhood',
-            group=private,
-            tooltip=_('My Neighborhood'))
+            group=private)
     neighborhood.connect('clicked', neighborhood_cb)
-    palette.append(neighborhood)
+    palette.append(neighborhood, _('My Neighborhood'))
 
     def update_share():
         neighborhood.handler_block_by_func(neighborhood_cb)

src/sugar/graphics/radiopalette.py

@@ -88,12 +88,16 @@ class RadioPalette(Palette):
         self.top.show()
         self.set_content(self.top)
 
-    def append(self, button):
+    def append(self, button, label):
         children = self.top.get_children()
 
+        # palette's button should not have sub-palettes
+        button.palette = None
+
         button.show()
         button.connect('clicked', self.__clicked_cb)
         self.top.pack_start(button, fill=False)
+        button.__palette_label = label
 
         if not children:
             self.__clicked_cb(button, True)
@@ -106,7 +110,7 @@ class RadioPalette(Palette):
         if not button.get_active():
             return
 
-        self.set_primary_text(button.props.tooltip)
+        self.set_primary_text(button.__palette_label)
         if not quiet:
             self.popdown(immediate=True)