wx.lib.buttons bitmap button mouse hover effect, howto??

Hi all,

I've been playing with generic buttons because I'd like to have a mouse
hover effect on flat bitmap buttons.

The existing ThemedGenBitmapButton add a themed rect even with the
wx.BORDER_NONE option and I don't want this.

I've come up with this trick of calling
wx.RendererNative.Get().DrawItemSelectionRect(self, dc, rect, state)

Is there a similar function (or would it be difficult to add) that shows
the 3d hover rect on a button, like when the mouse hovers on a toolbar
button?

##wx.lib.button.py test to have really flat buttons with an hover indicator

class FlatGenButton(GenButton):
    " Test for a flat bitmap button with mouse hover effect "

    def InitOtherEvents(self):
        self.Bind(wx.EVT_ENTER_WINDOW, self.OnMouse)
        self.Bind(wx.EVT_LEAVE_WINDOW, self.OnMouse)

    def OnMouse(self, evt):
        self.Refresh()
        evt.Skip()

    def DrawBezel(self, dc, x1, y1, x2, y2):
        rect = wx.Rect(x1, y1, x2, y2)
        if self.up:
            state = 0
        else:
            state = wx.CONTROL_PRESSED
        if not self.IsEnabled():
            state = wx.CONTROL_DISABLED
        pt = self.ScreenToClient(wx.GetMousePosition())
        if self.GetClientRect().Contains(pt):
            state = wx.CONTROL_CURRENT
        wx.RendererNative.Get().DrawItemSelectionRect(self, dc, rect, state)

class FlatGenBitmapButton(FlatGenButton, GenBitmapButton):
    """A themed generic bitmap button."""
    pass