Re: Curious event behaviour

Phew, what a relief. Many thanks Rich.
Yes, I tend to forget about 'update' and friends but now I should know
(and remember ).
Just an addendum for other Windows user: 'update idletasks' does not
suffice - I needed a fulll 'update'. 'idletasks' did result in a
change in so far a as window appeared immediatly - but it was empty.
Only with a plain 'update' appeared the complete window with the 2
rectangles immediately - and then the 2 events could fire as you
described in your exhaustive explanation.
I just read up on the documentation of 'update' and the way I
understand it is that  'update idletasks' should work - but I am no
native English speaker, so I let others decide. I only observed that
in my example it didn't.
Rich, thanks again for your help and have a nice weekend
Helmut