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How does one go about verifying an
entry field? Say you have a numeric only field. I looked at and
tried to use the key_press_event but couldn't get that to work. Then I
tried using the "changed" event on the entry field, checking the last
character for validity and, if invalid, truncating that character. That
works but leaves the cursor positioned one character beyond the new last
character. What is the way to do this?
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