self.newcurvename.set('')

        entry = tk.Entry(f, textvariable=self.newcurvename)

        entry.pack(side='left', fill='x',exp=1)        

        entry.bind("<Key-Return>", new_curve)

        def focus_entry():

            entry.focus()

        dispatcher.connect(self.add_curve, "add_curve", sender=self.curveset)

        dispatcher.connect(focus_entry, "focus new curve", weak=False)

    def add_curve(self,name, slider=None, knobEnabled=False):

        f = tk.Frame(self,relief='raised',bd=1)

        f.pack(side='top',fill='both',exp=1)

        leftside = tk.Frame(f)

        leftside.pack(side='left')

        collapsed = tk.IntVar()

        txt = "curve '%s'" % name

        if len(name) > 7:

            txt = name

                 width=15).pack(side='top')

        sliderLabel = None

        def cmd():

            if collapsed.get():

                if sliderLabel:

                    sliderLabel.pack_forget()

                f.pack(exp=0)

            else:

                if sliderLabel:

                    sliderLabel.pack(side='top')

                f.pack(exp=1)

                       variable=collapsed, command=cmd).pack(side='top')

        if slider is not None:

            # slider should have a checkbutton, defaults to off for

            # music tracks

            sliderLabel = tk.Label(leftside, text="Slider %s" % slider,

            sliderLabel.pack(side='top')

        cv = Curveview(f, self.curveset.curves[name],

                       knobEnabled=knobEnabled)

        cv.pack(side='left',fill='both',exp=1)

        self.curves[name] = cv