add the Tests for myTool, see test500, 501, 502, 503, 504, 505, 506, 507 and 508. I also added two functions in myTools: window_exists and getCurrentWindowIDs. corrected the bug that prevent fig.fignum to be actualized. It came from MyWin still using fig.keywords['fignum'] instead of fig.fignum. rmrk: in python fig.dict['key'] = value will not rise an error even if key does not exists.