HOWTO: v19.3 - CXTPPropertyGridEnum - how to empty

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   Hi;

After migration to v19.3, we no longer can 'empty' an enum property.
In older toolkit versions we set -1 in ctor and/or to the SetEnum() funtion. This does the trick.
In v19.3 we get an assert and the display value is not empty anymore.

BTW: The signature and implementation of the SetEnum function is not consistent:

void CXTPPropertyGridItemEnum::SetEnum(int nValue)
{
    m_nValue = nValue;

    if (m_pBindEnum)
    {
        *m_pBindEnum = nValue;
    }

    int nIndex = m_pConstraints->FindConstraint(XTPToULongPtrChecked(nValue));
    CXTPPropertyGridItem::SetValue(m_pConstraints->GetAt(nIndex));
}

Can you see the int --> unsigned long --> int conversion?
Why?