'Return the Tkinter instance of a widget identified by
its Tcl name NAME.'

def nametowidget(self, name):

    name = str(name).split('.')
    w = self
    if (not name[0]):
        w = w._root()
        name = name[1:]
    for n in name:
        if (not n):
            break
        w = w.children[n]
    return w
