Hi,

I have an Entry widget called Data, whose <Return> event is bound to a 
handler. If this handler recognizes invalid data I clear the 
corresponding textvariable and set the focus to itself by calling  
Data.focus_set(). Then I return "break".
Thus I'd like to let the user re-enter his data.
Unfortunately this doesn't work, the focus always proceeds to the next
Entry widget.
What am I missing?

Thanks for a hint,
Helmut.
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