CListBox - controlling horizonall scroll

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I am deriving a control from an owner draw CListBox.

I set the width of the list with SetHorizontalExtent()

It is wider than its client area and I get horizontal scroll bar as
desired.

Now when I press a given key I want it to scroll horizontally to a
position I have calculated.

I am catching the key press with VKeyToItem() - so far so good.

But trying to get it to scroll is driving me mad!

Any ideas on how to achieve this?

Dave
--
David Webber
Author MOZART the music processor for Windows -
http://www.mozart.co.uk
For discussion/support see
http://www.mozart.co.uk/mzusers/mailinglist.htm

[PS My first guess was

SetScrollPos( SB_HORZ, nPos, FALSE );
SendMessage( WM_HSCROLL, WPARAM(SB_THUMBPOSITION), LPARAM(0) );

but whatever nPos is the OnHScroll() handler receives nPos=0 and
nothing happens. ]


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