Following up on the previous answer: To enable the button again, you simply do this: 

  $button->configure( -state => 'normal' );

[download]
Note: In my experience with Tk on Win32 and UNIX platforms, I've found that Win32 uses 'disable' while UNIX uses 'disabled'.

In reply to Re: How do I disable ("grey out") buttons? by Eradicatore
in thread How do I disable ("grey out") buttons? by Anonymous Monk

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