Hi, I'm sorry to ask for help as a new user by this maillist. I sent a message to user list, but there is no answer over one week. The problem is: for my code, If I press 'x' or 'y' while panning, the motion still don't be constrained to the x or y axis respectively. The feature is important to my work, but currently i have not yet gotten the trick. For your information, NavigationToolbar2GTKAgg is used, and pick event is defined. Any help will be appreciated. -- sunzen <<freedom & enjoyment>>