Оформил: DeeCo
Автор: http://www.swissdelphicenter.ch

private
   procedure CMDialogKey(var Msg: TCMDialogKey); message CM_DIALOGKEY;
 end;


 implementation

 procedure TForm1.CMDialogkey;
 begin
   with Scrollbox1.VertScrollBar do
   begin
     case Msg.CharCode of
       // Delphi takes care of Position < 0 or Position > Range 
      VK_DWON: Position := Position + Increment; // down arrow key 
      VK_Up: Position   := Position - Increment; // up arrow key 
      else
         inherited;
     end;
   end;
 end;