Change of appdata is not visible

Hi! I have created two windows - main window and auxiliary. I am passing data through them using setappdata() and getappdata(). While debugging the program everything pass correctly. Getappdata() command line is placed just after auxiliary window launch. Getappdata() simply does not see change made in auxiliary window by setappdata() command. I had the same problem, while using global variables. In getappdata and setappdata I am using handle to main window (in auxiliary window i am recieving it by passing through varargin). For any tips I would be grateful :)