PSN_QUERYCANCEL does not close Property Sheet

I have a property sheet that I have created and each of the tab pages share the same pfnDlgProc. In the pfnDlgProc, I have this code:

switch (msg) {
    case WM_NOTIFY:
        nmhdr = (NMHDR*)lParam;

        switch (nmhdr->code) {
            case PSN_QUERYCANCEL:
                printf("PSN_QUERYCANCEL\n");
                SetWindowLong(nmhdr->hwndFrom, DWL_MSGRESULT, FALSE);

                return TRUE;
        }

        break;

    ...
}

When I click the Cancel button on my 开发者_StackOverflow中文版property sheet, PSN_QUERYCANCEL is printed, but the property sheet does not close. Why is this? Is there something else I need to do to allow it to/make it close? I know I can add DestroyWindow(nmhdr->hwndFrom) to the handler but is that the proper way to do it?

You are setting the DWL_MSGRESULT on the window handle that sent you the notification, but not necessarily the window that is the dialog you are processing the WM_NOTIFY for. Instead of using the nmhdr->hwndFrom window handle, try using the HWND that is passed to your pfnDlgProc.