I am using selectionIncludes to test for a selected index within a Listbox: 
if($lb->selectionIncludes($i) == 1)

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This works fine from my main window. However, 
if($lb2->selectionIncludes($i) == 1)

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does not work being the $lb2 is from a tab window using Tk:NoteBook example: 
$book = $main->NoteBook()->pack( -side=>'bottom',-fill=>'x', -ipadx=>0
+, -ipady=>185, -expand=>0 );
$tab3 = $book->add( "Sheet 3", -label=>"Reports", -createcmd=>\&Report
+s, -raisecmd=>\&Reports, -state=>'normal' );

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Has anyone used multiple Listboxes via NoteBook?

Edit by castaway - added code tags

In reply to Listbox selectionIncludes by Grubber

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