[pygtk] setting color of gtk.Entry

[vector]

hi im trying to set the color of either the bg or the text in  a 
gtk.Entry box,  if "prompt" has text in it. code below.
i cant seem to work out how to change the color tho?


    def dem_entry(self,length,x,y,tiptxt):
        """entry box for dem"""
        self.dem = gtk.Entry()
        self.dem.set_max_length(length)
        self.dem.set_size_request(x,y)
        self.dem.connect("activate", self.handle_dem_entry)
        self.pack_start(self.dem, False, True)
        if self.prompt!="":
            self.dem.modify_bg(gtk.gdk.Color(0,0,0))
        self.txttip.set_tip(self.dem,tiptxt, tip_private=None)