Aha! The trick was in creating 2 frames-containers. The first for A, B and the second for C, D. And I was wasting time trying to do the same with one frame-container (not possible with pack?).

In reply to Re^2: A question regarding Perl::Tk, pack (four panels four square) by Shumkar
in thread A question regarding Perl::Tk, pack by Shumkar

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