c# - .NET CF : Scrolling Issue (SB_TOP does not work)

Question

(.NET CF/Windows Mobile 6.5) I have a panel which contains some controls. I am using the below pInvoke to set the panel's scroll bar to the Top, with the page scrolled all the way up.

 private static extern int SendMessage(IntPtr hWnd, int msg, int wParam, IntPtr lParam);
        [DllImport("user32.dll")]

 SendMessage(this.tabPanel.Handle, WM_VSCROLL,6, new IntPtr(0));

The above line does not work in CF.

While the below ones are working

 SendMessage(this.tabPanel.Handle, WM_VSCROLL,2, new IntPtr(0));// page up
 SendMessage(this.tabPanel.Handle, WM_VSCROLL,3, new IntPtr(0));//page down

Issue is When I pass one of these values(6 or 7). 6 and 7 corresponds to

SB_TOP          = 6,
SB_LEFT         = 6,
SB_BOTTOM       = 7,
SB_RIGHT        = 7,

Any help on this,please?