dynamically scroll/change size of a dialog

I have some edit controls I've added at run-time to a modal dialog.

Since I don't know how many I'm going to need prior to run-time, I need a way to either resize the dialog or allow it to be scrolled.

I've tried using the following code (in my class based on the CDialog class) to re-size the HEIGHT of the dialog:

SetWindowPos(&wndTop, rect2.left, rect2.top, rect2.right, rect2.bottom + y,SWP_NOZORDER | SWP_SHOWWINDOW );

This doesn't work right though... it keeps expanding the WIDTH of the dialog. If I use GetClientRect, it doesn't work either. Then the WIDTH is shrinking.

What am I missing?
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     CRect rect2;
      SetWindowPos(&wndTop, rect2.left, rect2.top, rect2.Width(), rect2.Height()+50,SWP_NOZORDER | SWP_SHOWWINDOW );

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As you can probably infer from my example, you need to specify the height (bottom - top) you want the window to be rather then the location of the bottom coordinate.

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