'Set a specified item to become unchecked in the function list.
:param item_id: Index number of a specified item in the function list.
:type: int'

def set_list_item_unchecked(self, item_id):

    self._funcs[self._ipv_id][item_id] = 0
    item = self.ui.Functionlist.item(item_id)
    item.setCheckState(QtCore.Qt.Unchecked)
