Layout sizers

def _do_layout(self):
        """Layout sizers"""

        sizer_v = wx.BoxSizer(wx.VERTICAL)
        sizer_h = wx.BoxSizer(wx.HORIZONTAL)

        style = wx.ALL | wx.ALIGN_CENTER_HORIZONTAL | wx.ALIGN_CENTER_VERTICAL
        sizer_h.Add(self.logo_pyspread, 0, style, 10)
        sizer_h.Add(self.about_label, 0, style, 10)
        sizer_v.Add(sizer_h)
        self.SetSizer(sizer_v)
        sizer_v.Add(self.button_close, 0, style, 10)
        sizer_v.Fit(self)
        self.Layout()
        self.Centre()