@@ -592,9 +592,9 @@ class DotWindow(Gtk.Window):

         # Create actions

         actiongroup.add_actions((

-            ('Open', Gtk.STOCK_OPEN, None, None, None, self.on_open),

-            ('Export', Gtk.STOCK_SAVE_AS, None, None, "Save graph as picture.", self.on_export),

-            ('Reload', Gtk.STOCK_REFRESH, None, None, None, self.on_reload),

+            ('Open', Gtk.STOCK_OPEN, None, None, "Open dot-file", self.on_open),

+            ('Export', Gtk.STOCK_SAVE_AS, None, None, "Export graph to other format", self.on_export),

+            ('Reload', Gtk.STOCK_REFRESH, None, None, "Reload graph", self.on_reload),

             ('Print', Gtk.STOCK_PRINT, None, None,

              "Prints the currently visible part of the graph", self.dotwidget.on_print),

             ('ZoomIn', Gtk.STOCK_ZOOM_IN, None, None, None, self.dotwidget.on_zoom_in),

@@ -766,12 +766,23 @@ class DotWindow(Gtk.Window):

         subprocess.check_call(cmd)

     def on_export(self, action):

+        

+        if self.dotwidget.openfilename is None:

+            return

+        

+        default_filter = "PNG image"

+    

         output_formats = {

+            "dot file": "dot",

+            "GIF image": "gif",

+            "JPG image": "jpg",

+            "JSON": "json",

+            "PDF": "pdf",

             "PNG image": "png",

+            "PostScript": "ps",

             "SVG image": "svg",

-            "PDF image": "pdf",

-            "GIF image": "gif",

-            "PDF image": "pdf",

+            "XFIG image": "fig",

+            "xdot file": "xdot",

         }

         buttons = (

             Gtk.STOCK_CANCEL, Gtk.ResponseType.CANCEL,

@@ -793,7 +804,9 @@ class DotWindow(Gtk.Window):

             filter_.set_name(name)

             filter_.add_pattern('*.' + ext)

             chooser.add_filter(filter_)

-        

+            if name == default_filter:

+                chooser.set_filter(filter_)

+

         if chooser.run() == Gtk.ResponseType.OK:

             filename = chooser.get_filename()

             format_ = output_formats[chooser.get_filter().get_name()]