'Make (x, y) the current cell.'

def setcurrent(self, x, y):

    if (self.currentxy is not None):
        self.change_cell()
    self.clearfocus()
    self.beacon['text'] = cellname(x, y)
    self.load_entry(x, y)
    self.entry.focus_set()
    self.currentxy = (x, y)
    self.cornerxy = None
    gridcell = self.gridcells.get(self.currentxy)
    if (gridcell is not None):
        gridcell['bg'] = 'yellow'
