You could always resort to old school scroll bar creation. Note, the code below is for a Tree, but HList is very close.

my $CalTreeScrollBarY = $leftFrame->Scrollbar();
my $CalTreeScrollBarX = $leftFrame->Scrollbar(-orient=>"horiz");
$CalTree = $leftFrame->Tree(-yscrollcommand=>['set',$CalTreeScrollBarY
+],
                            -xscrollcommand=>['set',$CalTreeScrollBarX
+],);
$CalTreeScrollBarY->configure(-command=> [yview=>$CalTree]);
$CalTreeScrollBarX->configure(-command=> [xview=>$CalTree]);
$CalTreeScrollBarX->pack(-side=>"bottom",-fill=>"x");
$CalTree->pack(-side=>"left",-fill=>"both");
$CalTreeScrollBarY->pack(-side=>"left",-fill=>"y");
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