Display message box after authentication .

Thank you so much for creating this wonderful project.
Current we are able to open the message box before authenticating the user.
Sample code:
`HRESULT CSampleCredential::GetSerialization(
__out CREDENTIAL_PROVIDER_GET_SERIALIZATION_RESPONSE* pcpgsr,
__out CREDENTIAL_PROVIDER_CREDENTIAL_SERIALIZATION* pcpcs,
__deref_out_opt PWSTR* ppwszOptionalStatusText,
__out CREDENTIAL_PROVIDER_STATUS_ICON* pcpsiOptionalStatusIcon
)
{
HRESULT hr = E_UNEXPECTED;
count++;
if (_pWrappedCredential != NULL)
{
hr = _pWrappedCredential->GetSerialization(pcpgsr, pcpcs, ppwszOptionalStatusText, pcpsiOptionalStatusIcon);
/**tmpcpgsr = *pcpgsr;
*tmpcpcs = tmpcpcs;/

    HWND hwndOwner2 = nullptr;

    if (_pCredProvCredentialEvents)
    {
        _pCredProvCredentialEvents->OnCreatingWindow(&hwndOwner2);
    }

    if (true) {
        int i1;
        //// Pop a messagebox indicating the click.
        i1 = MessageBox(hwndOwner2, L"Click to proceed", L"Action", 1L);
        PrintLn("Ironcloud Dvi messagebox output:(%d)", i1);

        if (i1 == 1) {

        }
        else if (i1 == 2) {
            hr = -1;
        }
        else {
            hr = -1;
        }
    }`

Is it possible to display the message box after authenticating the user, but before displaying the desktop?

Regards,
Rajat KP