Hi John,

ListBox doesnot provide a interface for your to manipulate the scrollbar
directly. As a workaround, you can try sending WM_VSCROLL message via
PInvoke. For
example:

Class Win32
{
     [DllImport("User32.Dll")]
     public static extern bool SendMessage(IntPtr hWnd,int Msg,int  
wParam,int  lParam);      
     public const int WM_VSCROLL = 0x0115;
     public const int SB_LINEDOWN = 1;

}

Win32.SendMessage(listBox1.Handle,Win32.WM_VSCROLL,Win32.SB_LINEDOWN,0);

Hope this helps.

Regards,

Luke