Reparent issues with wxSlider and wxSpinCtrl

Hello list,

Tried reparenting some controls. As for wx.Button, wx.TextCtrl,
wx.ComboBox and wx.StaticText everything works fine, but reparenting a
wx.SpinCtrl makes its text field to disappear (only its arrow buttons
remain on screen) and reparenting a wx.Slider makes its handle to
leave tracks on screen when dragged (it looks like the handle is not
previously erased when dragged to a new position).

Is this a bug or some Reparent() restrictions?

[wxPython 2.5.5.1 ansi, Python 2.3.5, Win XP]

TIA

-- tacao