Binds events to handlers

def __bindings(self):
        """Binds events to handlers"""

        self.direction_choicectrl.Bind(wx.EVT_CHOICE, self.OnDirectionChoice)
        self.sec_checkboxctrl.Bind(wx.EVT_CHECKBOX, self.OnSecondaryCheckbox)
        self.pad_intctrl.Bind(EVT_INT, self.OnPadIntCtrl)
        self.labelsize_intctrl.Bind(EVT_INT, self.OnLabelSizeIntCtrl)