Do not hide the frame if menushell is active.

sugar/canvas/MenuShell.py

@@ -1,9 +1,27 @@
-class MenuShell:
+import gobject
+
+class MenuShell(gobject.GObject):
+	__gsignals__ = {
+		'activated':   (gobject.SIGNAL_RUN_FIRST,
+				        gobject.TYPE_NONE, ([])),
+		'deactivated': (gobject.SIGNAL_RUN_FIRST,
+				        gobject.TYPE_NONE, ([])),
+	}
+
 	def __init__(self, grid):
+		gobject.GObject.__init__(self)
 		self._menu_controller = None
 		self._grid = grid
 
+	def is_active(self):
+		return (self._menu_controller != None)
+
 	def set_active(self, controller):
+		if controller == None:
+			self.emit('deactivated')
+		else:
+			self.emit('activated')
+
 		if self._menu_controller:
 			self._menu_controller.popdown()
 		self._menu_controller = controller