DialogBoxIndirect creates dialog bigger than asked

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C++

Windows

dialog

For my application I need to create a Dialog Box without using resource.
I am trying to do it with DialogBoxInderect function.
The code is unbelievably ugly but somehow I succeeded to do it.

The problem is that dialog, for some reason, is much bigger than I asked with much bigger fonts.

Here is how the dialog looks like if I load it from resource:
http://i28.fastpic.ru/big/2012/0209/a2/f24d30f05221dc7593ec1e039f8b8da2.png

And here is the dialog with the same size stated when I call DialogBoxInderect function.
http://i28.fastpic.ru/big/2012/0209/c4/5e133dd0cf19ea50fec21873aa0f49c4.png

Here is how it is defined in code:

HGLOBAL             hGlobal;
LPDLGTEMPLATE       wlsDialogTemplate;
LPDLGITEMTEMPLATE   wlsDialogItemTemplate;
LPWORD              nextItem;
LPWSTR              itemString;
int32_t             itemStringLength;

// Check for memory allocation errors
hGlobal = GlobalAlloc(GMEM_ZEROINIT, 1024);
if (!hGlobal) 
    return -1;

wlsDialogTemplate = (LPDLGTEMPLATE)GlobalLock(hGlobal);

// Define a dialog box.
wlsDialogTemplate->style    = WS_CAPTION;
wlsDialogTemplate->x        = 0;
wlsDialogTemplate->y        = 0;
wlsDialogTemplate->cx       = 320;
wlsDialogTemplate->cy       = 115;

GlobalUnlock(hGlobal);
retCode = DialogBoxIndirect(0, (LPDLGTEMPLATE)hGlobal, 0, ActivateWlsMsgDialog);

And here is how it is defined in RC file:

IDD_WLS_SMALL_MESSAGE_DLG DIALOGEX 0, 0, 320, 115
STYLE DS_SETFONT | DS_MODALFRAME | DS_FIXEDSYS | WS_POPUP | WS_CAPTION
CAPTION "Dialog"
FONT 8, "MS Shell Dlg", 400, 0, 0x1
BEGIN
    DEFPUSHBUTTON   "OK",ID_CUSTOM_OK,175,95,120,15
    PUSHBUTTON      "Cancel",ID_CUSTOM_CANCEL,45,95,120,15
    CTEXT           "Static",IDC_HEADER_TEXT,120,10,170,70
    CONTROL         "",IDC_LOGO,"Static",SS_BITMAP,16,10,83,70
END

As you can see, the second dialog is much bigger than defined. I tried to play with various style flags but without any success (That is why there is red cross on the bigger dialog).

Any help with that?
Thanks!