Hi, I'm trying to replicate a non-blocking (or modeless) window behaviour from a Windows .NET application using Tkinter. The application I've got shows a new window in response to some event (might be non-GUI event) and the execution continues leaving the new window displayed. Here is the relevant code: private void foo(object sender, EventArgs e) { Form1 f = new Form1(); f.Show(); // displays a window and continues Console.WriteLine("Form created"); } The important bit is call to the Show() method [1] of .NET class System.Windows.Forms.Form. The foo() function may be called from a non-GUI application, as response to some signal or even invoked from a C++ application. The point is there is no explicit waiting for events and the window is modeless. How can I achieve similar behaviour in Tkinter? How to avoid calling mainloop() or wait_window() methods, which both are blocking? [1] http://msdn.microsoft.com/en-us/library/system.windows.forms.control.show.as... Best regards, -- Mateusz Loskot, http://mateusz.loskot.net