Problem with scrolls built-in in dialog

[dcgsmix]

Hey guys

I'm trying to create a dialog (resource) with styles Horizontal Scroll and Vertical Scroll.
Then i'm Using SetScrollInfo:

SetScrollInfo(SB_HORZ, &SCROLLINFO, TRUE);
SetScrollInfo(SB_VERT, &SCROLLINFO, TRUE);

Of course i'm setting the values for cbSize, nMin, nMax, nPage and fMask.

But, the scrolls doesnt move. even if i dont use SetScrollInfo

Can anybody help me?

Thanks,
Daniel