__declspec (property(get=_AngleGet, put=_AnglePut)) double Angle;
double _AngleGet()
{
    return(AngleGet());
}
void _AnglePut(double val)
{
    AnglePut(val);
}
virtual double AngleGet()
{
    //...
}
virtual void AnglePut(double val)
{
    //...
}