Quick question on listboxes

Say I want to add a string to a listbox (contained in a dialog) when I receive WM_CREATE... how would I go about getting the HWND for the dialog box? I know the HWND is in the LOWORD of wParam but using that only works if a WM_COMMAND was issued for that particular listbox.

hWndListbox=GetWindow(hWndDialog,ID_LISTBOX);

or

hWndListbox=GetDlgItem(hWndDialog,ID_LISTBOX);

Geez I'm stupid
I figured I'd need MAKEINTRESOURCE() or some other jazz. Thanks for even taking the time to answer such an obvious question.