In this docu
<http://wxpython.org/Phoenix/docs/html/Control.html#Control.GetSizeFromTextSize>
I can read
"Currently this method is only implemented for TextCtrl, ComboBox and
Choice in wxMSW and wxGTK."
But this methode work (nearly perfect) for wx.SpinCtrl for wxPhoenix on
KDE4 (Qt4).