update - flush graphics \f5update ?options? Changes made via Tk commands do not become visible until a call to update . Update flushes any pending changes to the screen. The following options are supported:

\f5-disable If this option is given, all updates are disabled. This is useful to enable a program to stop mouse movement causing automatic updates while it is making changes to the window.

\f5-enable This reverses a previous \f5update -enable invocation.

Changes that affect window sizes are visible immediately.