scrollbar-position or scrollbar-event

in a MDI-application it is not possible to get the scrollbar position of the
mainform with the API-function:
GetScrollPos(MainForm.ClientHandle,SB_HORZ).

does anybody know another way to get the value.

if I could get an event for the scrollbar, it would be one step forward.

thanks for any help!

--
Frank (GiAmbH)