Such a functionality does not exist. You have to create a normal Tk::Button and implement the logic yourself in its -command.
لսႽ† ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ

In reply to Re^3: Entry widget with explicit submit button by choroba
in thread Entry widget with explicit submit button by amiksingh

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