def create_shift_element(self, parent, value):
field = IntCtrl(parent,
value=value,
style=wx.TE_PROCESS_ENTER | wx.TE_RIGHT,
size=self.element_size)
field.index = self.shift_vector.GetItemCount()
self.shift_vector.Add(field, flag=wx.EXPAND | wx.RIGHT, border=5)
self.Bind(wx.EVT_TEXT_ENTER, self.on_shift_field, field)
