def _set_tk_config(self, keys, value):
<EOL>if isinstance(keys, str):<EOL><INDENT>keys = [keys]<EOL><DEDENT>for key in keys:<EOL><INDENT>if key in self.tk.keys():<EOL><INDENT>if value is None:<EOL><INDENT>self.tk[key] = self._tk_defaults[key]<EOL><DEDENT>else:<EOL><INDENT>self.tk[key] = value<EOL><DEDENT><DEDENT><DEDENT>
Gets the config from the widget's tk object

:param string/List keys:
    The tk config key or a list of tk keys.

:param variable value:
    The value to set. If the value is `None`, the config value will be
    reset to its default.