'custom' events ?

[William Gill]

I am trying to create a Python UI in Tkinter and have several (frame) 
widgets that display various data fields.  I am trying to create a 
'changed' event that each widget can trigger when they have been edited. 
  I see lots of references that suggest that 'custom' events can be 
created, but haven’t found any that give me a clue as to how.  Also, can 
parent or sibling widgets capture the 'custom' event (similar to using 
<F1>)?

Thanks,

ill