How to change combobox to ownerdraw at runtime?

I'd like to change a combobox control to owner-draw at runtime. In the resource script the control is layed out as a standard control.

I've experimented with setting the style bits to CBS_OWNERDRAW | CBS_HASSTRINGS but somehow this does not help.

Does anybody know the trick?

Try SetWindowLong() function

I used SetWindowLong to or in the CBS_OWNERDRAW | CBS_HASSTRINGS styles.

Thats the code I use:

// turn to ownerdraw
DWORD dwStyle = ::GetWindowLong(hCtrl, GWL_STYLE);
dwStyle |= CBS_OWNERDRAWFIXED | CBS_HASSTRINGS;
VERIFY(0 != ::SetWindowLong(hCtrl, GWL_STYLE, dwStyle));

This code is processed in the WM_INITDIALOG message handler.

Unfortunately it doesn't work.

Anybody already done that?