The Tk::MsgBox is intended to be a simplified widget that displays as soon as it is created.

So, your suspicion is correct. To fix it, move the creation of the MsgBox to the point where the value is available (inside "quiz_me"). You do not reference $front and $back elsewhere in any case.

You might want to consider making your interface a little nicer by using a Tk::DialogBox , when you get tired of annoying popup dialogs. The dialogBox could be pre-populated with the answer, which will have its VISIBLE property off. A button can then be pressed to REVEAL it. It would also help to have a NEXT button to step through the quiz. Essentially, your app becomes a single dialog box, which is a pretty standard way of implementing simple stuff.

     "As you get older three things happen. The first is your memory goes, and I can't remember the other two... " - Sir Norman Wisdom

In reply to Re^3: Tk::MsgBox and my -message string by NetWallah
in thread Tk::MsgBox and my -message string by davidov0009

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.