'This command is used to indicate whether the entry given by
entryPath has children entries and whether the children are visible. mode
must be one of open, close or none. If mode is set to open, a (+)
indicator is drawn next to the entry. If mode is set to close, a (-)
indicator is drawn next to the entry. If mode is set to none, no
indicators will be drawn for this entry. The default mode is none. The
open mode indicates the entry has hidden children and this entry can be
opened by the user. The close mode indicates that all the children of the
entry are now visible and the entry can be closed by the user.'

def setmode(self, entrypath, mode='none'):

    self.tk.call(self._w, 'setmode', entrypath, mode)
