Traceback (most recent call last):
File "c:\vnstudio\lib\site-packages\vnpy\trader\ui\widget.py", line 473, in cancel_order
order = cell.get_data()
File "c:\vnstudio\lib\site-packages\vnpy\trader\ui\widget.py", line 62, in get_data
return self._data
AttributeError: 'TimeCell' object has no attribute '_data'
