Problem with IWebBrowser2

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C++

MFC

COM

Hi codeproject community,

normally I never bother an internet forum with my problems but I am kind of desperated right now.
So here's the issue:

I have an MFC application with an webbrowser control in the gui contained. For this purpose I created a new class deriving from the necessary com interfaces to cope with all requirements. By now it more or less works pretty good, the only problem I'm still encountering is that I can't zoom or rather alter the font size inside the html control.

As usually I looked up the msdn documentation and came up with this code snippet (which ought to work according to the general consensus on the internet):

VARIANT vFontSize;
VariantInit (&vFontSize);
V_VT(&vFontSize) = VT_I4;
V_I4(&vFontSize) = 4;   //arbitrary picked zoom value out of a possible range from 0 to 4
//m_pBrowser->ExecWB(OLECMDID_PRINT, OLECMDEXECOPT_DONTPROMPTUSER, &vFontSize, NULL);
//EDIT:
m_pBrowser->ExecWB(OLECMDID_ZOOM, OLECMDEXECOPT_DONTPROMPTUSER, &vFontSize, NULL);

But no matter what I try, there's not any change of the displayed html content.

Anyone got an idea?