How can I create a non-modal dialog in Perl/Tk?

I am learning Perl/Tk. I want to give alert to the user whenever he/she receives the mail.

I have planned to use message box in Tk, but it is expecting the user to click ok or cancel button.开发者_JAVA百科

Until user clicked the any one button it wont do any further operations.

But I want, it just needs to give alert to the user and user can continue with the further process.

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Refer the link

Non blocking a Dialog box in Perl Tk