MoveWindow() of a groupbox overtop another groupbox

I am performing a MoveWindow on a groupbox within a dialog such that I want one groupbox to overlay another groupbox. Both groupboxes are defined on the dialog with the exact same dimensions. However, when I perform the MoveWindow() command, the groupbox I wish to move actually appears about 1/4 inch below the groupbox I am trying to overlay.

Here is the code I am using:

m_wndGroupToOverlay = a CButton assigned control to the groupbox. (I don't know why ClassWizard only gave me this choice for a member variable assignment...but...)

m_wndOtherGroupBox = another groupbox member variable for a groupbox defined elsewhere in the dialog.

In OnInitDialog():
(..after calling the default ::OnInitDialog)
m_wndGroupToOverlay.GetWindowRect(&m_rectGroupToOverlay);

In SomeOtherFunction:
m_wndOtherGroupBox.MoveWindow(&m_rectGroupToOverlay);

This results in the offset groupbox, when I was expecting it would be covering the original groubox completely.

Any thoughts?

Thanks
LVL 1
rascalAsked:
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nietodCommented:
answer coming.

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nietodCommented:
Its a matter of  coordinate systems. GetWindowRect() returns the window's coordinates relative to the top left corner of the screen.  MoveWindow() takes coordinates that are relative to the top-left corner of the window's parent window's client area.

nietodCommented:
The following code should fix the problem, or at least be close, I may not have the math perfect.

 m_wndGroupToOverlay.GetWindowRect(&m_rectGroupToOverlay);
CWnd *ParWndPtr = GetParent();
POINT Pnt = {0,0};
ParWndPtr->ClientToScreen(0,0);
m_rectGroupToOverlay.Left -= Pnt.x;
m_rectGroupToOverlay.Right -= Pnt.x;
m_rectGroupToOverlay.Top -= Pnt.y;
m_rectGroupToOverlay.Bottom -= Pnt.y;

let me know if you have questions.
rascalAuthor Commented:
Thanks, I used ScreenToClient to change the coordinates and it worked as intended.
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