Thanks! That set me on the right track!

A mixture between 1186926 and the sub wheel_browse from 1186662 works for me

Rata

sub selectProjectDialog_newtest
{
    $mw    = shift;                        # store the main window
    my @project_choices =  split(" ","Project1 Project2 Project3 Proje
+ct4 Project11 Project12 Project13 Project14 ") ;

    my $projectSelection_tl= $mw->Toplevel( ); 
    $projectSelection_tl->title("Select the project:");
    $projectSelection_tl->Label(-text    => 'Select the project Id:', 
+  )->grid(-row =>   5, -column =>  10, -sticky => "w");
    
    my $scrolled1 = $projectSelection_tl->Scrolled
                            ("Listbox", -scrollbars => "se", 
                                        -width => 50, 
                                        -height => 4,
                                        -selectmode => "extended")
                            ->grid(-row => 10, -column => 10, -columns
+pan => 10, -rowspan => 10); 
    $scrolled1->insert ("end", @project_choices);
    $scrolled1->Subwidget('listbox')->bind('<Enter>', sub{$scrolled1->
+Subwidget('listbox')->focus()});
    $scrolled1->Subwidget('listbox')->bind('<MouseWheel>',[ \&wheel_br
+owse, $scrolled1, Tk::Ev('D')]);
}
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