this is how listbox does it

sub ClassInit
{
 my ($class,$mw) = @_;
 $class->SUPER::ClassInit($mw);
 # Standard Motif bindings:
 $mw->bind($class,'<1>',[sub {
               my $w = shift;
               if (Tk::Exists($w)) {
                 $w->BeginSelect(@_);
               }
             }, Ev('index',Ev('@'))]);
 $mw->bind($class, '<Double-1>' => \&Tk::NoOp);
 $mw->bind($class,'<B1-Motion>',['Motion',Ev('index',Ev('@'))]);
 $mw->bind($class,'<ButtonRelease-1>','ButtonRelease_1');
 ;
 $mw->bind($class,'<Shift-1>',['BeginExtend',Ev('index',Ev('@'))]);
 $mw->bind($class,'<Control-1>',['BeginToggle',Ev('index',Ev('@'))]);

 $mw->bind($class,'<B1-Leave>',['AutoScan',Ev('x'),Ev('y')]);
 $mw->bind($class,'<B1-Enter>','CancelRepeat');
 $mw->bind($class,'<Up>',['UpDown',-1]);
 $mw->bind($class,'<Shift-Up>',['ExtendUpDown',-1]);
 $mw->bind($class,'<Down>',['UpDown',1]);
 $mw->bind($class,'<Shift-Down>',['ExtendUpDown',1]);

 $mw->XscrollBind($class);
 $mw->bind($class,'<Prior>', sub {
           my $w = shift;
           $w->yview('scroll',-1,'pages');
           $w->activate('@0,0');
       });
 $mw->bind($class,'<Next>',  sub {
           my $w = shift;
           $w->yview('scroll',1,'pages');
           $w->activate('@0,0');
       });
 $mw->bind($class,'<Control-Prior>', ['xview', 'scroll', -1, 'pages'])
+;
 $mw->bind($class,'<Control-Next>',  ['xview', 'scroll',  1, 'pages'])
+;
 # <Home> and <End> defined in XscrollBind
 $mw->bind($class,'<Control-Home>','Cntrl_Home');
 ;
 $mw->bind($class,'<Shift-Control-Home>',['DataExtend',0]);
 $mw->bind($class,'<Control-End>','Cntrl_End');
 ;
 $mw->bind($class,'<Shift-Control-End>',['DataExtend','end']);
 # XXX What about <<Copy>>? Already handled in Tk::Clipboard?
 # $class->clipboardOperations($mw,'Copy');
 $mw->bind($class,'<space>',['BeginSelect',Ev('index','active')]);
 $mw->bind($class,'<Select>',['BeginSelect',Ev('index','active')]);
 $mw->bind($class,'<Control-Shift-space>',['BeginExtend',Ev('index','a
+ctive')]);
 $mw->bind($class,'<Shift-Select>',['BeginExtend',Ev('index','active')
+]);
 $mw->bind($class,'<Escape>','Cancel');
 $mw->bind($class,'<Control-slash>','SelectAll');
 $mw->bind($class,'<Control-backslash>','Cntrl_backslash');
 ;
 # Additional Tk bindings that aren't part of the Motif look and feel:
 $mw->bind($class,'<2>',['scan','mark',Ev('x'),Ev('y')]);
 $mw->bind($class,'<B2-Motion>',['scan','dragto',Ev('x'),Ev('y')]);

 $mw->MouseWheelBind($class); # XXX Both needed?
 $mw->YMouseWheelBind($class);
 return $class;
}
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