diff --git a/fluents/navigator.py b/fluents/navigator.py
index e6b5f49..9f670be 100644
--- a/fluents/navigator.py
+++ b/fluents/navigator.py
@@ -18,10 +18,10 @@ class NavigatorView (gtk.TreeView):
         gtk.TreeView.__init__(self) 
 
         # various properties
-        self.set_enable_tree_lines(True)
+
+        #self.set_enable_tree_lines(True)
         self.set_headers_visible(False)
         self.get_hadjustment().set_value(0)
-        self.set_enable_tree_lines(True)
 
         # Selection Mode
         self.get_selection().set_mode(gtk.SELECTION_MULTIPLE)
@@ -58,7 +58,7 @@ class NavigatorView (gtk.TreeView):
 
    
     # sets data for drag event.
-    def slot_drag_data(self,treeview,context,selection,target_id,etime):
+    def slot_drag_data(self, treeview, context, selection, target_id, etime):
         treeselection = treeview.get_selection()
         model, paths = treeselection.get_selected_rows()
         if paths:
@@ -183,7 +183,7 @@ class NavigatorView (gtk.TreeView):
 class NavigatorMenu(gtk.Menu):
     def __init__(self, navigator):
         gtk.Menu.__init__(self)
-        self.navigaotor = navigator
+        self.navigator = navigator
         self.dataset = None
         self.tree_iter = None        
 
@@ -277,9 +277,15 @@ class NavigatorMenu(gtk.Menu):
         plot = plots.ImagePlot(self.dataset, name='Image Plot')
         icon = fluents.icon_factory.get("line_plot")
         project.data_tree_insert(self.tree_iter, 'Image Plot', plot, None, "black", icon)
+        # fixme: image plot selections are not well defined
+        #plot.set_selection_listener(project.set_selection)
+        #project._selection_observers.append(plot)
 
     def on_plot_hist(self, item, navigator):
         project = navigator.project
         plot = plots.HistogramPlot(self.dataset, name='Histogram')
         icon = fluents.icon_factory.get("line_plot")
         project.data_tree_insert(self.tree_iter, 'Histogram', plot, None, "black", icon)
+        plot.set_selection_listener(project.set_selection)
+        project._selection_observers.append(plot)
+