Change View of Modal Dialog

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WinMobile

WinMobile6

VisualC++

Does anyone know a possibility of changing the view on a Modal Dialog?
e.g. the Dialog has a size of 1660x2000,
the screen size is 166x200,

I would like to quickly change the origin (0,0) of the CDialog to (167,0) for example or (167,201)

My first attempt was like this:

CRect r1;
GetDlgItem(IDD_DIALOG1)->GetWindowRect(r1);
r1.MoveToX(r1.TopLeft().x+166);
r1.MoveToY(r1.TopLeft().y+200);
GetDlgItem(IDD_DIALOG1)->MoveWindow(r1);

...this won't work / i get an error at (debug-) runtime.

any help / suggestions would be welcome!