I like the procedural form of grid, so I don't have to care about -row and -column. Here's your sample rewritten:
foreach (sort keys(%density)) {
Tk::grid(
$mb->Label(
-text => $_,
-anchor => "w",
),
$mb->Entry(
-textvariable => \$density{$_},
-width => 5
),
-sticky => "ew",
);
}
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