'Changes the image and label of the widget.
:param newlabel: the text that will be used for the label
:param newimage: the stock widget from where extract the image
:param newtooltip: the text for the tooltip'

def change_internals(self, newlabel, newimage, newtooltip):

    self.toolbut.set_tooltip_text(newtooltip)
    self.toolbut.set_label(newlabel)
    self.toolbut.set_property('stock-id', newimage)
